What causes a blower motor to stop working?

Table of Contents

What causes a blower motor to stop working?

In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. Blower motors generally don’t fail out of the clear blue.

How does a blower motor work in a car?

Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor. In one design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connection on the blower motor resistor.

Can a blower fan only work on high speed?

Blower Motor Fan Only Works On High Speed? Plus – Tips To Prevent Repeat Failures! If playback doesn’t begin shortly, try restarting your device. Diagnostic training videos and content hosted by ASE Master and L1 Certified Technicians.

Why does my blower motor make a squealing noise?

The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds.

Why does my blower only work on high speed?

If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. This is the most common failure mode. To repair the problem, simply replace the resistor block.

Why is my HVAC fan not working in my BMW?

HVAC fan doesn’t work at all. In BMW cars, the blower motor resistor often overheats due to incorrect current measurements implemented during the design and engineering of the vehicles. This can cause the HVAC fan to not work at all due to motor failure, and it is unable to blow any air out of the vents.

What happens when a motor fails on a HVAC fan?

This can cause the HVAC fan to not work at all due to motor failure, and it is unable to blow any air out of the vents. This can be highly concerning during especially cold or warm months of the year. Additionally, if the resistor stops working you might notice that the HVAC can only run on one speed—usually a high speed.

What does the blower motor do in a BMW?

The blower motor resistor in your BMW is part of the HVAC system, or the heating and air conditioning system. The system requires a motor, called the blower motor, which powers the fan utilized to propel air from your cabin vents.

How is the speed of the blower motor controlled?

The blower resistor is connected in series to the blower fan motor. This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack.

How do you fix a blower motor on a car?

Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal.

Where does the ground go in a Honda blower motor?

The blower motor control module (Honda calls it Power Transistor) supplies the ground. The power transistor has 4 wires: two come from the climate control system control unit, one is the ground, one goes to the negative terminal of the blower motor.

Why is the blower motor not working on my car?

My car has an automatic transmission. Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

The blower resistor is connected in series to the blower fan motor. This means that the current running through the blower motor, and its’ speed is therefore controlled by the resistor value. The user chooses a fan speed by selecting a speed which then connects one of the resistors in the blower resistor pack.

The blower motor control module (Honda calls it Power Transistor) supplies the ground. The power transistor has 4 wires: two come from the climate control system control unit, one is the ground, one goes to the negative terminal of the blower motor.

What are the symptoms of a failed blower motor resistor?

Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn’t work at low speeds.

Where are the fuses on an Audi A6 C7?

For the Audi A6 (C7) (4G) 2011, 2012, 2013, 2014, 2015, 2016, 2017 model year. Fuse box in passenger compartment. fuse box location. The fuses are located at the front left and right of the cockpit. Driver side of the cockpit: fuse panel cover. fuse box diagram. legend. Fuse Amps Circuits Protected 1 5A TCS/ESP button

What to do if your AC fuse keeps blowing?

If you need help troubleshooting AC short-cycling or AC breaker tripping and fuse blowing in Maryland or DC, call 240-342-6910. You can also contact us online to schedule AC repair Call us at 240-342-6910 for an AC inspection or repair in the DC or Maryland area! Can I DIY Fix a Blown AC Fuse or AC-Related Breaker Trip?

What are the symptoms of a bad blower motor relay?

3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.

Where is the blower control switch on the dashboard?

The blower control switch on the dashboard controls the circuit flow of the blower motor to adjust the voltage from low, to medium, to medium-high, to high. When on high, the circuit bypasses the blower resistor.

How does the HVAC control head work on a blower?

In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. Based on the driver’s input to the blower speed switch, the HVAC control head sends a digital signal to the blower motor speed control module.

What are the signs of a bad heater motor?

Common signs include the car’s heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. 1. Blower motor stuck on one speed 2. Blower motor does not work on certain settings 3. No air from the vehicle’s vents Average rating from 130,908 customers who received a Vehicle Engine Cooling Inspection.

What does it mean if your blower motor is not working?

Average rating from 849 customers who received a AC is not working Inspection. The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed.

3. Melted relay. Another more serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems.

The blower control switch on the dashboard controls the circuit flow of the blower motor to adjust the voltage from low, to medium, to medium-high, to high. When on high, the circuit bypasses the blower resistor.

What to do if your AC blower is not working?

Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor. Connect cables to motor and resistor. Turn on car and test AC. Thanks for watching! Loading…

Where is the blower resistor on a 2017 Chevy?

Hit the A/C button, compressor is coming on, so not a low Freon issue. On the 2017, I located the blower resistor plugged into the duct on the passenger side, upper left area of the foot area, was surprised to find out that it could be accessed without even removing the cover for the blower area.

What are common reasons my Buick Verano has heater problems?

What are common reasons my Buick Verano has heater problems? While there are a variety of reasons your Buick Verano heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

Why is my blower fan not working on my Ford F 150?

Blower fan not working – 2004-2014 Ford F-150 and other models. Blower Motor Resistor Replacement If playback doesn’t begin shortly, try restarting your device.

Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor. Connect cables to motor and resistor. Turn on car and test AC. Thanks for watching! Loading…

What happens when the blower fails on a Chevy Equinox?

When the blower motor fails, the air conditioner and heater may still work, and heat or cool may be felt at the vents, but the air pressure will be dramatically decreased. This Read More When the heater control valve fails, adjusting the temperature may not change the air temperature at the vents, whether hot or cold.

When do you need a new blower motor?

If you are getting 120 volts to the motor and it is not starting then you have a blower motor problem and either need another new blower motor or a new blower motor run capacitor. If you are not getting voltage to the blower motor out of the control board then you probably need a new control board again.

Why does my furnace blower not come on?

I have an older Maytag furnace that will fire up but the blower motor doesn’t come on, after a minute the the limit switches will turn of the furnace because it will get to hot. I already replaced the motor, the limit switches, and the motor board but I still have the same problem.

What should I do if my blower fan wont come on?

You will need to test with a voltmeter and see if your fan motor is getting the required 110 to 125 volts AC out of your control board to start the motor. I would suggest setting your thermostat to the “Fan ON” position. You should be getting 120 volts out of the control board.

In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. Blower motors generally don’t fail out of the clear blue.

How does a blower motor resistor control the fan speed?

The blower motor resistor controls the fan speed of the blower motor and the resulting change in air pressure produced by the movement of the blower fan. It accomplishes this by regulating the electric current that powers the motor.

How to diagnose a blower motor problem?

Place two large straight pins in the plug of the blower motor but leave the blower motor plugged in. Place a voltmeter across the two pins. Turn on the ignition and turn the blower switch through each position.

How do you turn on a blower motor?

With a blower, you essentially ‘turn on the ground’. The blower always has a positive current going to it when the key is on. You turn the blower on by completing the circuit to ground. First check the fuse and all connections. Second, check to see if there is any power at the blower motor.

When to know if your BMW blower motor resistor is failing?

It’s important to be able to notice slight changes in your BMW’s performance so that you can address such issues before the colder or warmer months of the year come up, leaving you without a working HVAC system. These are the most common problems and symptoms associated with blower motor resistor problems:

Why is my AC blower not working?

A common problem behind an air conditioner blower not starting includes overheating, which keeps the motor from running. Let your air conditioner rest and cool down for a while before trying to turn it on again; if the motor works at that point, overheating is probably the problem.

What are the symptoms of blower motor failure?

  • Lack of air from the vehicle’s vents
  • Stuck on specific settings
  • Stuck at one speed

    Is my blower motor bad?

    No air from the vents. No air flow from the vents when the heater or air conditioning is activated is another symptom of a bad blower motor. If the heater blower motor burns out or short circuits, it will not function, and therefore will not be able to produce any airflow for the system. The blower motor will usually have to be replaced in order…

    Why does blower motor resistor keep going out?

    The blower motor appears to be defective here. When the brushes wear out the motor draws excessive amps which could cause the resistor to burn out. Before making further replacements remove the motor and check it, especially the brush assembly. This is the most likely reason for the resistor to fail repetitively.

    Why does my GM blower make a screeching noise?

    Now you should be able to spin the fan without the motor making any noise. If the screeching noise is still happening from your blower motor, either the noise is coming from a different part of the motor, in which case I’m little help, or you just haven’t gotten the bearing loosened from the motor shaft.

    The electronic module that controls the speed of the blower motor is called a blower motor control module. In some cars, the blower motor has only 4 or 5 fixed speeds. In this case, the speed of the blower motor is controlled by a blower motor resistor.

    The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds.

    Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor. In one design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connection on the blower motor resistor.

    What happens if a heater blower has no power?

    A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

    What happens if you lose the blower motor relay?

    The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor,…

    Common signs include the car’s heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. 1. Blower motor stuck on one speed 2. Blower motor does not work on certain settings 3. No air from the vehicle’s vents Average rating from 130,908 customers who received a Vehicle Engine Cooling Inspection.

    Where does the power go in a blower motor?

    For each higher speed, power flows through one less resistor. Some car makers run blower motor power through the fan speed switch first, then through the blower motor resistor and then to the blower motor and ground. Other car makers reverse that and run power to the blower motor first and terminate ground at the blower fan speed switch.


    Why is my furnace or AC blower not working?

    Furnace or AC Blower Motor Not Starting or Working! Top 10 Reasons Why! – YouTube If playback doesn’t begin shortly, try restarting your device.

    Why does my furnace blower have a hum?

    Then restart the blower motor and listen. If the hum persists, then so do you. When your furnace blower has warmed your house to the set temperature, it begins to run on a slower speed. This is a normal energy saving mechanism that the motor is supposed to employ.

    Why does my fan blower not come on?

    If it does not come on then you might have a control board fan relay that is not sending 120 volts to the blower motor or a bad blower motor winding. You might try to change wires (speeds) on the blower motor to see if that fixes the problem.

    What should I do if my blower motor is not working?

    If it’s good, refer to a wiring diagram for your vehicle and conduct these tests: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls.

    What causes a blower motor to overheat?

    Decreased airflow causes the blower motor resistor to overheat and fail. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. Blower motor is drawing too much power. Check the cabin air filter for clogging.

    Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal.

    The electronic module that controls the speed of the blower motor is called a blower motor control module. In some cars, the blower motor has only 4 or 5 fixed speeds. In this case, the speed of the blower motor is controlled by a blower motor resistor.

    Where is the blower motor resistor located on a car?

    It’s located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.

    How does a blower motor resistor work in a car?

    This is done, so the resistor or a control module is cooled down by passing air. In some older cars, a blower motor resistor was installed on the firewall with the access from under the hood. Problems with a blower motor resistor are common in many cars.

    Why is my front blower motor not working?

    My son, which drives the vehicle, stated that the blower motor just stopped working while going down the road. I began checking it out by checking all fuses and relays. All appear fine.

    Is it safe to use a blower with a motor?

    I bench tested the blower and it worked fine. I have power from the switch to the blower resistor and from the resistor to the motor. Plugging the resistor back in, plugging the motor into the resistor but the motor fails to work. I did notice that the power to the resistor and to the motor are constantly hot, don’t know if that is normal.

    What kind of motor does a variable speed blower use?

    Variable speed blower motors don’t use a blower motor resistor. Instead they use a blower motor speed control or a power transistor. Variable speed motors are most often used in vehicles with automatic climate control.

    How does a half speed blower motor work?

    So a half speed driver request will result in the blower motor controller pulsing the ground connection off twice as often as when the fan is running at full speed. Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor.

    Why does my blower not work at high speeds?

    Blower works on slow speeds, but not on high speed. Check for bad fuse or bad high speed relay. Swap the high speed relay with another relay with the same part number. Also, check the fuse for the control side of the high speed relay. Make sure the ground side of the high speed relay is working. Blower works on some speeds but not others

    Variable speed blower motors don’t use a blower motor resistor. Instead they use a blower motor speed control or a power transistor. Variable speed motors are most often used in vehicles with automatic climate control.

    What should I do if my blower wont shut off?

    If the blower stops with either of these steps, the problem is in the HVAC control module. However, if the blower continues to run at high speed with either of those tests, replace the blower motor control processor. Just as an FYI, the retail price of the blower motor control processor is $280.34.

    What are the symptoms of a worn out blower motor?

    One of the symptoms of a worn out blower motor is that it can intermittently produce a loud screeching noise when running. How to test a blower motor? If the blower motor doesn’t work at all, the blower motor itself must be tested first. Typically it’s done by measuring the voltage at the blower motor connector when it’s turned on.

    Where does the power transistor go in a blower motor?

    The power transistor has 4 wires: two come from the climate control system control unit, one is the ground, one goes to the negative terminal of the blower motor. The service manual advises measuring the voltage at the blower motor, then if not OK, at the power transistor and so on.

    The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor,…

    Why does my floor fan not turn on?

    If you turn on your fan and the fan motor hums even though the fan blades won’t move, the cause may be that the gears are stuck. Once you’ve cleaned the fan as outlined in the previous step, try unscrewing the motor housing so you can see the electric motor parts.

    So a half speed driver request will result in the blower motor controller pulsing the ground connection off twice as often as when the fan is running at full speed. Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor.

    What causes a blower fan to not work?

    When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blower motor to work intermittently. A blower fan is connected to the negative battery terminal (also called ground) on one end and to the positive battery terminal through a blower motor resistor on the other end.

    When does a blower motor start to fail?

    In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up.

    Why is the resistor not working on my blower?

    Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

    Why is my Delta 88 heater fan not turning on?

    My 1999 Olds Delta 88 heater fan switch turns blower on only occasionally and even then the high setting cuts off the fan (if it’s working). Probably a bad blower motor resistor you have there, or possibly a faulty blower motor or switch. The most common thing would be the resistor assembly, as that goes out more often than the other parts.

    Why is my GM 3.8L blower not working?

    If the blower motor in your 3.8L GM vehicle is stuck in only one speed (usually stuck in high) or no blower speeds work, then there’s a good chance that the blower control module is bad and behind the problem.

    Where is the blower motor on a Hyundai Accent?

    Turn on the power to your blower motor. Now locate the motor. It’s usually up under the glove box area on the passenger side. Under the dash in the very right corner. If you can find it, take a large ratchet and rap on the bottom of the motor.

    How to replace a blower resistor and motor?

    Easy video on how to replace blower resistor and motor with 1 screw driver and in about 10min. Remove glove box, pop bottom panel off to gain motor access. Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor.

    Why is my a / C blower not blowing?

    A metal that when it corrodes, it turns white, and unlike copper, aluminum corrosion does not conduct electricity at all and causes resistance issues and can cause overheating of a circuit. Took out a common finger nail Emory board and went to work, both sides of each contact, then used a small brass brush on each side and along the tips.

    How can I tell if my blower motor resistor is faulty?

    Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor.

    Is the blower motor on a Chevy Silverado working?

    Blower Motor does not work on 1 and 2 speed chevy silverado – YouTube I had a Bad Relay. I got one here https://amzn.to/2PSr6fQ It seems the 88-94Trucks have a different system to control the speeds than the 96-00 OBS style Ch…

    If the blower motor in your 3.8L GM vehicle is stuck in only one speed (usually stuck in high) or no blower speeds work, then there’s a good chance that the blower control module is bad and behind the problem.

    Hi There, The resistor is what controls the speed of the blower motor, not the relay. The blower motor relay supplies power to this motor when you turn the switch to “on” that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all.

    When did GM start using blower control module?

    This is because this particular blower control module was used in several models from 1992 to 1999. To find out if your particular GM vehicle is covered by this troubleshooting tutorial, check the box titled “ Applies To: ” on the right column.

    How to test the blower control module 3.8L?

    Where To Buy The Blower Control Module And Save. TEST 1: Verifying The Blower Control Module Is Getting Battery Power And Ground. TEST 2: Bypassing the Blower Control Module. TEST 3: Verifying The Blower Speed Voltage Signal. More 3.8L GM Tutorials.

    How does the voltage affect the blower motor?

    This varying voltage signal is the blower motor speed signal that tells it what blower speed you’ve just selected on the A/C-Heater control panel. The blower control module then translates this blower motor speed signal from the A/C-Heater control panel signal and applies the corresponding voltage directly to the blower motor. Empty.

    What are the symptoms of a bad heater motor resistor?

    Symptoms of a Bad or Failing Heater Blower Motor Resistor. 1 1. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower 2 2. Blower motor does not work on certain settings. 3 3. No air from the vehicle’s vents.

    What happens if you have a bad blower motor?

    The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air.

    Why does my a / C front blower stop working?

    No matter how many times (or position) the fan speed knob is moved, the front blower motor fails to respond. A/C system can be turned off and on multiple times, but the front blower fails to respond.

    What causes a bad or failing blower motor relay?

    Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current…

    What to do when your AC fan stops blowing air?

    If your AC has stopped blowing air, has weak airflow, or you hear unusual noises, do a quick inspection of the fan motor. The motor is located in the condenser unit. Listen for a humming sound that tells you the AC compressor is functioning.

    Can a blower motor relay be a problem?

    One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. As the relay is the switch that supplies current to the blower motor, if it fails internally, then power will be cut off from the blower motor circuit, causing the motor to no longer function or blow any air from the vents.

    How does a high speed blower motor work?

    In the highest fan speed state, the blower resistor is bypassed completely and the fan is effectively connected directly to the car’s battery, allowing maximum current to be supplied to the blower motor.

    How are the resistors arranged in a blower motor?

    Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. Blower resistors can burn out. When that happens, you lose that speed.

    What causes a fuse to blow on a blower motor?

    If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

    How can I tell if my blower motor is failing?

    On all systems, a failed blower motor is least likely. Blower motors generally don’t fail out of the clear blue. In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing.

    When do you need to replace a blower motor?

    If you don’t feel any airflow coming out of the vents, it may mean that a problem with the blower motor has developed to the point where the component is entirely inoperable. In this case, you’ll have to replace it with a new motor.

    Why is my blower motor resistor not working?

    The blower motor resistor controls the speed of the blower motor indirectly by relaying electrical current to the blower motor control module. If the resistor isn’t working properly, then you’ll experience concerning and inconvenient symptoms in your BMW’s cabin.

    Why is my furnace blower fan not turning off?

    Limit Switch Issue | Furnace Blower Fan Wont Turn Off If the furnace overheats, then a limit switch will open. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. In some cases, the limit switch will stick open, and this will cause the fan to run continuously.

    When do you need to replace the blower motor relay?

    If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay. 1. Blower motor does not function 2. Blown fuses 3. Melted relay The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor.

    When does a blower motor resistor need to be replaced?

    If the resistance is out of specs, the resistor must be replaced. For example, in this photo we measured the resistance of this blower motor resistor. According to the service manual, it must be around 4-5 ohms. In our case the ohmmeter shows open circuit, which means the resistor has failed.

    CLICK HERE TO RESET YOUR PASSWORD! Help! Fan quit working on all 4 speeds. AC light & recirc light still light up and AC compressor clutch engages when turning fan on in AC mode, but not getting the fan to work. I replaced the blower motor resistor and the control unit with new parts from rockauto (ACDelco).

    What to do if your blower fan is not working?

    Blower Motor Resistor Replacement – YouTube Blower fan not working – 2004-2014 Ford F-150 and other models. Blower Motor Resistor Replacement If playback doesn’t begin shortly, try restarting your device.

    Where is the relay on a blower motor?

    Correction assuming 97 is same (probably is)… Fan relay is as posted before on top of the duct work left of the resistors you can see both behind the glove box if you take it out. The purple wire comes from the relay/resistors according to fan speed selected.

    Why is the blower motor on my Dodge Ram not working?

    Discussion in ‘ Tech Info ‘ started by HeavyD, Dec 10, 2016 . Ok was driving & doing errands today, blower motor working good – no problems. Then after dropping stuff at home, got back in the truck & blower motor does not do anything. Checked the #4 fuse, even swapped it with another & still nothing.

    How can I tell if my Hyundai blower motor is working?

    Check again with a test light for power across the fuses, just to make sure. Next check if the relay is good and that power is coming to it by checking for power at the orange colored wire and the other wire which could either be red and black, or red and blue. When checking for power ensure that the key is turned to the on position.

    Why are all of the gauges in my car not working?

    There are a lot of different types of instrument cluster designs and configurations, but when all of the gauges in a car stop working at once, the problem is usually either a fuse or wiring problem. The first step in diagnosing this type of issue is to identify the fuse associated with the instrument cluster or gauges.

    There are a lot of different types of instrument cluster designs and configurations, but when all of the gauges in a car stop working at once, the problem is usually either a fuse or wiring problem. The first step in diagnosing this type of issue is to identify the fuse associated with the instrument cluster or gauges.

    Check again with a test light for power across the fuses, just to make sure. Next check if the relay is good and that power is coming to it by checking for power at the orange colored wire and the other wire which could either be red and black, or red and blue. When checking for power ensure that the key is turned to the on position.

    Why is my Hyundai blower motor not working?

    The resistor going bad is a fairly common problem which is easily fixed though it is an issue which is often missed. If this does not resolve the problem then check if there is a problem with the outside ambient air temperature sensor. If this shorts it breaks the circuit and the AC will not work.

    How do you troubleshoot a blower motor resistor?

    This can be annoying, but troubleshooting is easy. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time. Power supplied from the fuse panel passes through the switch to the blower resistor assembly.

    How do you test the power of a blower motor?

    Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. Testing at the motor itself eliminates the possibility of confusion caused by complicated electronic blower controls found in Electronic Climate Control systems.

    This can be annoying, but troubleshooting is easy. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time. Power supplied from the fuse panel passes through the switch to the blower resistor assembly.

    When do you Know It is time to replace your blower motor?

    If you notice your blower motor is not functioning on certain speed settings, has a burning plastic smell, or the blower continues to run with the ignition in the off position, it may be time to replace your blower motor. Here are some steps you can take to confirm whether or not this replacement is necessary.

    Is the blower motor on my 2003 Buick not working?

    2003 buick lasabre heater blower… 2003 buick lasabre heater blower motor not working, changed out the fan still no good, where is the blower motor relay and fuse located Submitted:9 years ago. Category: Buick Show More Show Less

    Why is my Buick LaSabre heater not working?

    2003 buick lasabre heater blower motor not working, changed out the fan still no good, where is the blower motor relay – Answered by a verified Buick Mechanic We use cookies to give you the best possible experience on our website.

    How to replace heater / AC fan motor on a Buick?

    How to replace the Heater/AC fan motor on a Buick. – YouTube If playback doesn’t begin shortly, try restarting your device. An error occurred. Please try again later.

    Why does my blower motor not come on?

    You should be able to find this relay or sequencer by tracing the blower motor wires back to the relay or sequencer. If power is going into the sequencer or relay and not coming out when the 24 volts are applied then you have a relay or sequencer problem and the sequencer or relay will need to be replaced to get your blower running right again.

    Where is the blower motor located on a car?

    They always mount the interior fan near the evaporator and heater cores. Depending on the year, make, and model you may find this component both in the interior cabin area or outside in the engine compartment side of the firewall. If it’s in the engine bay you’ll most often find it near the firewall.

    How does a resister block work on a blower motor?

    The resister block used on many models is coupled with a control module. It’s used to control the output speed of the blower motor. A resister block will adjust its total resistance as selected by the driver from the switch. As more resistance is applied to the circuit the slower the interior fan motor will spin.

    Who is the owner of the 1984 Caprice Classic?

    This 1984 Caprice Classic is a one owner vehicle that looks like it has been owned by a fairly fastidious person. The overall condition of the car is fairly impressive, and I need to thank Barn Finder Pat L for referring this beauty to us.

    Discussion in ‘ Tech Info ‘ started by HeavyD, Dec 10, 2016 . Ok was driving & doing errands today, blower motor working good – no problems. Then after dropping stuff at home, got back in the truck & blower motor does not do anything. Checked the #4 fuse, even swapped it with another & still nothing.

    Why does my blower motor not turn on?

    Then after dropping stuff at home, got back in the truck & blower motor does not do anything. Checked the #4 fuse, even swapped it with another & still nothing. Im guessing its mot the switch or resistor. So is the motor gone?? Its stupid cold outside so did not check power at the motor, so don’t know it has power or not.

    Where can I get a new blower motor resistor?

    I replaced the blower motor resistor and the control unit with new parts from rockauto (ACDelco). I’ve checked the fuse in the dash fuse panel and it is good.

    How many volts does a blower motor have?

    At low is might have 5V, M1 7 ish, and M2 9 ish volts. (note mine is not working and I think resistors are bad I get 11.9V on hi 11.73 v on all other speeds lo, m1, and m2. Anyone ever measure what voltages are normal to speeds ?

    Why does my blower fan spin at a certain speed?

    It send a certain amount of voltage to the motor to have it spin at the requested speed you select on the control head. To do this, there are resistors built into the unit to control the voltage. If you are not familiar with how electricity works, basically it comes down to this…resistance causes heat.

    Why is my blower motor stuck on one speed?

    Blower motor stuck on one speed A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.

    Is there a blower motor that does not work?

    Blower motor does not work on 1 or 2 speeds. I have yet to attempt repair. I replaced the blower motor resistor but selection 4 (high) don’t work. Motor makes a squealing noise for a few minutes but stops on (3). But still blows. Blower only works on high.

    What happens when a blower motor resistor fails?

    The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.

    What to do if your Mercedes heater blower is not working?

    My blower motor was fixed in with 3 posidrive screws. Had to use a stubby screwdriver on one of them too due to a serious lack of room. Check first before just pulling it out Rooty.

    How can I check if my blower motor is working?

    You can also check for power to the blower. If you pull the drivers side front window plastic the output from the ccu is pretty accessible. If you checked the external spots then I would pull the blower and inspect that. not hard to get to the blowerunit.

    Can a car blower motor be repaired?

    While problems such as a loose or damaged belt and bad alignment can be easily fixed , they can cause damage to the blower motor or its surrounding components if you don’t fix them promptly. A trained technician can perform a thorough inspection of your blower motor and let you know if it needs to be repaired or replaced.

    One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow.

    Why is my AC fan not blowing?

    The most common causes of an AC not blowing are related to: fan problems. power issues. thermostat problems. clogged filters. blocked registers. dirty coils. ductwork leaks & blockages.

    Furnace or AC Blower Motor Not Starting or Working! Top 10 Reasons Why! – YouTube If playback doesn’t begin shortly, try restarting your device.

    How much does it cost to replace a blower motor?

    See: how to check a fuse in a car. If a blower motor is bad, it will need to be replaced. The blower motor replacement costs from $320 to $650, depending on the car. In many cars it’s fairly easy; the blower motor is located behind the glove box and held by 3-4 screws.

    Is the blower fan in auto or on?

    Funny the blower works in “on” position and not “auto”. Thank you for taking the time to read. Know someone who can answer? Share a link to this question via email, Twitter, or Facebook.

    What does the blower motor resistor do in a car?

    The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

    Why is my front AC blower not working?

    I’ve seen many posts from people whose front AC blower would stop occasionally. My wife would kick the wires under the glove compartment and it would start again. It finally failed altogether. Following the advice from other owners, I replaced the blower motor resistor. That didn’t help.

    How can I tell if my AC blower motor is broken?

    Air Conditioner Blower Motor Won’t Turn On. If you turn on your air conditioning system and find that there is no air blowing out of the AC unit, or no buzz of the blower fan motor, then it is possible the AC blower motor has an issue. This is one of the most common and easy ways to know if your air conditioner blower motor is broken or not.

    Why is the blower motor on my 2010 F150 not working?

    The blower motor on my 2010 F150 is not working. At first I checked the fuses they are good. I moved the wiring around Have Ford questions? Ask a mechanic for answers ASAP By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.

    Why is my F150 HVAC blower so slow?

    The first thing that my mind went to was resistance, in that there’s a bad ground. Sounds like your dealer has thrown one too many head units and resistors at it; time to start hunting for the wiring issue between the controller and blower motor. I do notice however that my fan speed dial is a little slow to respond..

    Why is my F150 fan not working properly?

    Sounds like your dealer has thrown one too many head units and resistors at it; time to start hunting for the wiring issue between the controller and blower motor. I do notice however that my fan speed dial is a little slow to respond.. I chalk this up to it being a resistance-based switch that’s computer controlled. Hope they get you sorted out!

    How does the impeller work on a blower?

    The impeller is essentially a fan blade that draws air into the blower housing and forces it out the blower tube. The impeller is installed in the blower housing, where you can find it attached to the crankshaft of the engine. When the crankshaft turns, it rotates the impeller, which causes air to flow through the blower.

    Why is my air blower not blowing air?

    However, in some models the tubes funnel air down to a nozzle that increases the speed of the air flow. In this case, it might seem as if the blower isn’t blowing air, or isn’t blowing enough air. This can be a result of missing or damaged tubes.

    Why does my blower fan keep getting ground on Black Wire?

    The AC system itself has trouble and has a leaky AC compressor (which I also bought a new one to replace!). I broke out the old trusty multimeter and it seems as though the purple wire on the fan motor gets +12v at all times with the fan switch anywhere but OFF.

    What to do if your Chevy Silverado blower does not work?

    Although you can jump to just separating the steering column cover. I find it much easier to remove the instrument cluster trim panel first. Then the knee bolster or under dash cover. Next a well placed screw driver and a little twisting and the tilt lever pops out.

    What does the blower motor connector do on a car?

    Touch device users, explore by touch or with swipe gestures. The blower motor connector links the blower motor to the blower motor resistor. The blower motor is part of your vehicle’s air conditioning and heating system that pushes air through your vehicle’s vents.

    How to test the blower motor resistor ( 1988-1993 pickup )?

    CASE 2: All circuits tested had continuity where indicated in the test steps. This is good and is the correct and expected test result that tells you that the blower motor resistor is OK and not the cause of the blower motor speed problem. If your pickup’s blower motor resistor passed this continuity test, you can stop here.

    How to troubleshoot your furnace blower motor fan?

    A third quick and simple troubleshooting step for your furnace blower motor is to make sure the filters and vents are clean and free of dust and debris. To do this, go to each of your home vents and ensure they are open and clear. Next check the cold air return filter for dirt or dust build up.

    How do you change a blower motor on a car?

    Change the cabin air filter at this time if it is due for replacement, since you have easy access to the filter. Going headfirst into the footwell with a flashlight, look up until you locate the blower motor. Locate the three to six bolts keeping it in place, and remove with sockets and ratchet.

    What can cause heater not work?

    The most obvious reason an electric heater doesn’t work is that it’s not receiving any power . Start by checking the circuit breaker to see if it has been tripped. If it has, it’s an easy fix – simply turn it off and turn it back on again. You may also have to replace the fuse if it has blown.

    Why is my AC heater not working?

    The potential issues here vary whether your heating has gone out or your car’s AC system is on the fritz. Common reasons for the heating system not to work include the following: Low coolant. Air in the coolant system. Malfunctioning heater core. Failed (or failing) thermostat.

    Why is my furnace blower motor not working?

    Another common problem with furnace blower motors not working is caused by the “three D’s”; dust, dirt and debris. These three alone can cause overheating of the motor, which in turn causes the windings and bearings to burn up quicker. Dirt, dust and debris can cause the blower motor to overheat and seize up.

    Why would a car heater stop working?

    Here are a few of the more common reasons that’s causing the car heater to not work properly: The amount of coolant in the system is too low. When your vehicle’s engine has cooled down, open the radiator cap and check the level of coolant.

    Where is the regulator on a Mercedes fan blower?

    The Mercedes Benz fan blower motor regulator is a series of resisters in a printed circuit board about 2-inches square located right next to the blower motor.

    How to test the blower motor resistor ( GMC )?

    Thankfully, testing the blower motor resistor is not that hard and in this tutorial I’ll show you 4 different tests that will help you troubleshoot it and find out if it’s bad (or not). This tutorial applies to several Chevrolet, GMC and Oldsmobile pickups and SUVs.

    What does it mean when a blower motor does not turn?

    Changes in voltage indicate that the resistor is working and that the switch is able to vary the speed of the blower. If there is voltage but the motor doesn’t turn, disconnect the plug and connect one of the motor’s terminals to a good ground and the other to a 12-volt fused source. The motor should spin at its highest setting.