the problem is when the baffles move from heat to ac and vent to defrost they either get stuck or the controllerr is bo. this system is built to fail safe in the defrost mode. Thus ac comes from Defrost vents. Apparently it is wide spred with Ford and Chev. As it is in my 2001 Ford F-350, My opinion To much Matel Toy company plastic and cheep parts we pay considerable money for from the dealers. 1) check your controller at the dash probably vacume 2) check the acutator at the butterfly flapper. Some vehicles are easier than others.....
does fan door motorized or on a vaccuum line when you switch from AC to defrost?
DO NOT FEAR THIS !!! The ac comes on with the defrost: because do you ever use your ac in the winter? me neither. Manufactures have made the ac come on with the defrost to prevent the ac compressor from seizing up. Since we never use them in winter, at least in cold climates. Cheers and drive on.
It is important to have a working AC system in a car. A wiring diagram for an F250 AC system can be found in the cars maintenance manual.
Yes, the ac will run in the defrost position to dry the windshield.
vacuum leak. look at the vac pump under the hood on the pass side and check the hoses for dry rot or cracks
cooling fan relay short or bypassed or defrost or ac selector on
There is most likely a vacuum leak on the line from the engine to the air conditioner control.
If it has AC assist and the compressor is shot, cut the belt or disconnect the defrost from the compressor.
Did you happen to move it to Defrost when you turned it off? The ac compressor also runs in the defrost cycle to keep the seals lubricated during the winter months when the ac is not used.
On my 1995 Ford Explorer when the defrost position is selected , and the temperature knob is set in the red area to get heated air to defrost the windshield , the A/C compressor will cycle on and off to help dehumidify the air, but the compressor ONLY cycles on and off in the DEFROST POSITION ( sorry if I'm misinterpretting your question )
you have to trick the ac computer by shuting it off then restarting it...
You have vacuum line leaks somewhere.
you need to replace the vacuum.
No, especially since the AC is used when you defrost the windows.
The ac system also removes humidity which helps clear the window faster.
There is no A/C defrost relay. The defrost mode of the heating and air coditioning is a default mode whenever the system is not operating as it should. It automatically goes to defrost mode when the system is not operating as it should.
check the alternater Something to do with your electrical in your vehical so i think you should get that checked out right away or just don't use your ac or defrost and your vehical should be ok..
does the ac just stop or does the defrost also come on out of the blue?
2001 dodge ram 1500 ac and heater flow regulator switch does not work. works only on defrost. How to fix?
The systems AC system will run when the defrost is turn on.The manufactor does this to remove humity from the air making it easier to defrost the windsheild.The AC system should only run when the defrost is on though.If you are experiecing a high pressure promblem when the AC is running it is pronbly due to a overcharge of refrigerant.
Pull the A/C fuse or disconnect the wiring at the compressor. The A/C comes on to provide drier air to help defog the windows. You can de-select the A/C by pressing the A/C button on the dash, when you turn on the defrost.
The ac will turn on when the HVAC is in defrost mode, no matter what the temp is set at.
the mode door inside the hvac unit has most likely broken causing to to default to defrost. sometime the actuator is at fault, wither way the dash has to come out
My best guess is your AC belt is in bad shape and tightens when you engage the AC/Defrost.