2004 envoy a/c and idle problem

jjrbradley

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when running the a/c and sitting at a light or stopped elsewhere, the idle drops WAY down (engine almost dies), then revs back up. Does this constantly. The air also gets warmer. Once I am back driving, all is well, and air is ice cold again. IT only does this while a/c is on. I was idling at a store and turned the a/c switch off; no more idle problem.
Can someone please tell me what this could be? I have already had thermostat and O2 sensor replaced. (thanks to info I found on here I told the dealer what to check) :)
 


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