Question about 1996 GMC Sierra

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AC only warm air is coming through the vents

1996 GMC truck, I put a pressure gauge on the low point and it shows 40. One thing I noticed the compressor runs all the time and I think it used to kick in and out??

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  • gilutz Jun 22, 2009

    First I put direct power from the batterie to the compressor and it worked as it should - than I added one can of RED TEK and the cold air is back.

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There is a clutch under the pully you see turning that allows the belt to turn without running the compressor.you may want to check the optimum pressure rating for yuor truck.it sounds to low to me.check that with your local auto parts dealer.hope this helped

Posted on Jun 18, 2009

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