Automotive Air Conditioning Information Forum (Archives)

jmichaelrush on Sun June 07, 2015 11:21 AM

Year: 2009
Make: Buick
Model: Enclave
Engine Size: 3.8
Refrigerant Type: R-134a
Country of Origin: United States

The problem started on a trip back from Jacksonville after Memorial Day.
The AC would stay cold (not ice cold like when we first got it, but rather just on the verge of being comfortable) while moving, but as soon as we stopped moving it would start hissing (loss of pressure) and the muggy hot air would start to blow.
I thought I had narrowed it down to broken temperature gauge: the AC blows cold whenever the fans are blowing on the condenser. But the fans only come on every once in a while. I sat there and watched them for a long while with the AC cranked to MAX and the engine idling and the only rhyme or reason to the fans turning on that I could see was engine temperature. I also tested the refrigerant pressure with one of those refrigerant-in-a-can bottles and it is almost perfect.

Now, it has decided to finally just start blowing hot air and won't get cold at all and the vacuum hiss is constant. I can hear the compressor clutch engage when the AC comes on.

Any ideas anyone?

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2009 Buick Enclave

TRB on Sun June 07, 2015 1:06 PM

You are going to need to get a proper set of gauges to start with. Check operating pressure in relation to the fans coming on.

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