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.....
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..
If you have the defroster on, the ac comes on automatically.
Check for vacuum leak either under hood or under dash Check for bad vacuum actuator under dash Defrost is the default setting
Buy a kit at Wal-Mart or auto parts comes with instructions
A vacuum leak, or one of the doors is sticking/bad vacuum motor in the heater box.
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.
does fan door motorized or on a vaccuum line when you switch from AC to defrost?
vacuum leak. look at the vac pump under the hood on the pass side and check the hoses for dry rot or cracks
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.
cooling fan relay short or bypassed or defrost or ac selector on
Yes, the ac will run in the defrost position to dry the windshield.
recharge ac
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.
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 )
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.
you need to replace the vacuum.