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A/c kicks on when switched to defrost - 1995 GMC Sierra C1500

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Ac always kick on with defrost it takes moisture out of the air so window clears up

Posted on Aug 29, 2009

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Any time most cars /trucks are in teh defrost mode wether you have the heat or a/c on the compressor will come on and run thats what helps defrost the windows when its cold out or raining nothing wrong with it.

Posted on Jan 08, 2009


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A/c kicks on when switched to defrost

I would say you have coolant loss somewhere and its not blowing out heat. Check to see if you have enough coolant. Otherwise for the ac kicking on, that might just be faulty wiring. try tracing back the wiring form the compressor and make sure you dont have any open circuits.

Jan 08, 2009 | 1995 GMC Sierra C1500

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