AIR CONDITIONER WON'T TURN OFF on 2002 GMC Envoy

For the last couple of months; we've notice when we want to just have outside air or heat; it seem that the air conditioner just stays on. What could the problem be and what would it cost? Sincerely, Pauline Demers

by in Livermore, ME on April 13, 2010
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1 answer
ANSWER by , August 23, 2010
I have the same problem. I changed the compressor relay but that didn't correct it. Spraying the compressor clutch with WD40 worked for a short time, so I think maybe the compressor clutch staying engaged is the problem. Due to the cost, I haven't changed the compressor...yet. Please let me know if you find anything that works.