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.

What is the function of the blower motor relay?

The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems.

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.

How are the air vents on a car operated?

On newer cars the vent direction and temperature controls are operated by a series of 3 or 4 electrical actuator motors which are adjusted by the climate control module. On older cars with manual controls these vent and temperature controls are operated by vacuum servos. Vacuum is provided by the engine while it is running.

Can a car vent blow cold one side and hot the other?

In a vehicle with dual temperature controls you may encounter a situation where the vent blows cold one side, hot on other side or vice versa.

Why does my HVAC blow cold air and hot air?

Drivers changed air temperature far more often than they change the mode (defrost, floor heat, dash vents, etc.), so the temperature actuators generally fail first. When that happens, the HVAC system can be stuck on blows cold air or blows hot air. In a dual zone system, you wind up with a blows cold one side, hot on other side condition.

How does the air vent work on a defroster?

The vent control system for the defroster in integrated into the operation of all temperature controls and uses forced air provided by the blower motor. On newer cars the vent direction and temperature controls are operated by a series of 3 or 4 electrical actuator motors which are adjusted by the climate control module.

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.

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.

What happens when a blower motor relay wears out?

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, and is subject to the constant on and off switching. Over time, it can eventually wear out.

Why is my Chevy tracker heater not working?

While there are a variety of reasons your Chevrolet Tracker 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.

How to replace the blower motor on a 2003 Chevy tracker?

Be careful of the courtesy light. Remove the blower moter and disconnect the purple/black power connector to it – – you’ll need this extra room to work with. 2 more screws, same size, 6.5mm on mine, 7or 8mm on some others, that holds the blower motor resistor in place. This replacement part is less than 40 bones at most parts store.

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 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.

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…

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.

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.

How is the speed of the blower motor controlled?

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.

How does the blower motor work on a Honda Accord?

Typically it can be activated by pressing and holding different buttons. Testing Honda power transistor (blower motor control module). For example, in the 2009 Honda Accord, the service manual describes the procedure as follows: Turn the ignition to ON.

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 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.

What to do when your AC Fan is not working?

Checked for incoming resistance ground to the blower, from the dash control switch and it works. Checked for battery at the blower, when the car is running. There is no battery to operate the blower. Rotated all the PDC relays around, they have the same ID, other than ABS pump.

What happens if heater blower motor does not work?

Therefore, if major problems in the heating and air conditioning system fail, as if the power supply to the motor was completely cut off due to overheating or corrosion, the motor will simply not work, which in turn will render the entire heating and air conditioning system unusable, as no air will flow through the vehicle’s air vents. 2.

How can you tell if your air conditioner blower motor is overheating?

If your blower motor is overheating, you’ll see some very clear signs. One of the common signs of overheating is a burning smell coming from the vents. This is usually accompanied by a complete system shutdown. An air-conditioner with an overheating blower motor may shut itself off to prevent damage and electrical hazards.

Why is my air blower not running on a / C?

Usually if its that, the air does blow from the vents. FAN BLOWER NOT RUNNING ON A/C BUT RUN ON HEATER, and ALSO couldn’t turn on the FAN from the thermostat, Need help, Please My ac air blower went bad in my trailer but for the last 6 months it couldn’t keep up with temp l had it set on, will new one be able to keep up ?

How to choose the right air conditioner blower motor?

In order to get the right blower motor for your air-conditioner, the contractor has to take a number of things into consideration, including the type of drive, the diameter of the motor, rotation direction, horsepower, voltage, speeds, and size of the capacitor.

What to do if your dash light does not work?

#Test the dashboard light bulbs. If the fuses are working properly, check for a blown bulb in the dashboard. Following the manufacturer’s instructions, disconnect the battery while working on the dash, remove the faceplate covering your vehicle’s dashboard gauge panel. Remove the screws holding the plate on. Carefully remove the faceplate.

Why does my AC / heater blower not work?

My radio, windshield wipers and ac/heater fan will not work. It will however work when you turn the key all the way back or forward but not when the engine is running. Not sure if it is a fuse problem or not. It is a 2003 and has 176,xxx miles on it. It’s not a fuse problem. You probably have a bad ignition switch.

Why is the radio not working on my car?

The entire dashboard lights, gauges, speedometer, radio. I mean everything doesn’t work. I drove the car home and it drove fine no noticeable problems.When i click the power button for the stereo it turns on and then right way the batter saver screen appears and it shuts off.

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.

What happens when you turn the blower speed knob?

To be more specific, as you turn the blower speed knob… the blower switch ‘opens’ and ’closes’ two contacts. The opening and closing of these contacts is what diverts the incoming blower motor current to different resistors within the blower motor resistor assembly.

What should I do if my blower motor stops?

Replace blower motor. If you have a variable speed blower motor, replace the blower motor speed control module. If you have a three or four speed blower motor, remove the blower motor relay. If the motor stops, replace the relay. Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period.

Where is the heater blower wire on my F53?

Check the wire on the heater box under the dash on passenger side. Right under the glove box. I think it is a red wire about 12 guage and on my F53 it has been pulled loose a couple of times by some one’s foot from the passenger seat. Posted By: C-Leigh Racing on 03/30/10 08:00am

What to do if your heater blower is not working?

Was able to pull one of the vents out on the front of the dash & kinda got some access to the blower motor wires, ol test light lit right up when the switch was turned on. There is a rubber vent tube connected to the back end of the motor & after pulling that loose, I could rotate the armature easy so its not locked up in the shaft bearings.

Why is the blower motor relay not working?

As I understand things – the blower motor relay acts as a switch completing the electrical circuit between the battery, your fan switch, the resistor and the blower motor. It operates when both the ignition switch and fan switch are in the on position. When this relay goes toes up – then nothing on the circuit gets power.

Why does my heater blower resistor not work?

This circuit comes complete with a resistor to allow you to control the speed of the heater fan. The main symptom of motor failure is when it does not work regardless of the speed at which it is set. Spikes in current occur when the motor relay (the device which powers the motor) fails. This in turn can damage the fuse.

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.

Are there any Ford Focus blowers left in stock?

. Only 1 left in stock – order soon. . Only 5 left in stock (more on the way). . Only 11 left in stock – order soon. . Only 4 left in stock – order soon.

When to replace an AC heater blower motor?

A lack of airflow from your vents is a clear indicator that it may be time for a heater blower motor replacement. With our wide variety of replacement AC heater blower motors, AutoZone can help make your ride enjoyable again – no matter what you drive.

What are the symptoms of a bad blower motor resistor?

Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings.

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?

What are common reasons my Ford Escort has heater problems?

What are common reasons my Ford Escort has heater problems? While there are a variety of reasons your Ford Escort 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. See what others are asking about their Ford Escort.

What to do if your Ford Fusion heater is not working?

When the blower motor resistor fails, the air conditioner and heater may still work, but air may blow from the vents at only some of the fan speed settings. If the resistor isn…

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.

Why is the temperature gauge on my Ford Escort not working?

Switch on the ignition BUT DO NOT START if the gauge reads hot renew the sender, if the gauge still does not work the circuit may be open or the gauge may be faulty. Loading…

What to look for when your car fan is not working?

Your vehicle should have a complete relay diagram showing the location of all of the vehicle’s electrical components such as fuses and relays. To fix any blower, the first things to look at are the fuses, relays, and electrical connections.

Where is the blower control switch on the dashboard?