Why does my car defrost when I Turn on the AC?

This is a very common problem on vehicles with vacuum actuated HVAC controls. The plastic vacuum lines break and the system defaults to defrost. This is a very common problem on vehicles with vacuum actuated HVAC controls. The plastic vacuum lines break and the system defaults to defrost. Skip navigation Sign in Search Loading… Close

Why does my dash heater go from Defrost to floor?

I discovered wiggling the tiny vacuum line that goes in through firewall above the heater core pipe caused the heat to go from defrost to floor (dial control turned to floor heat). I’ll double check vacuum lines for leaks before I dismantle dash.

Where does the air come from when I Turn On my AC?

When I turn on my AC or Heater air will only come out of my defrost. It don’t matter when I turn my air control (foor, front, defrost) the air still only comes out of my defrost at the winshield

How do I stop no air from dashboard vents?

This door is controlled by a thumb wheel that when activated will open and close the vent air flow door. Work the thumb wheel from one side to the other while checking the airflow. The flow should stop and start again, if the thumb wheel does not make a difference the problem is somewhere else.

What to do if your air conditioner has ice around it?

Turn off the A/C and set the fan to run (usually “auto”) on your thermostat to melt the ice around the coil. Check the air filter and evaporator coil for dirt and debris. Clean it up. Check the ductwork for obstructions or disconnections, and ensure no registers are blocked.

How to divert water from air conditioner drip hole?

I do not want my new balcony furniture to get soaked. Solution 1 – Use a water hose that connects to the drip hole. You could use a PVC plastic bushing (if the A/C drip hole is threaded) then attach the water hose and divert the water wherever you wish.

Where is the air door actuator under the dash?

Most vehicles, this is located directly under the passenger side dash or behind the glove box. If the fan works on high speed only, then you know that you have a bad resistor. You will want to make sure that the connector hasn’t burnt out as well. Replace resistor and connector as needed.

What to do if your air conditioner wont turn on?

Turn off the A/C and set the fan to run (usually “auto”) on your thermostat to melt the ice around the coil. Check the air filter and evaporator coil for dirt and debris.