Question about 2002 GMC Yukon XL

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Overheating when outside temp goes above 90 degrees F

I drive for a corporate car service in NYC with my 2004 Yukon XL Denali, and I noticed during the summer when the temp goes above 90 degrees and I'm sitting still idle for more than 10 min with the AC on. I notice the temp gauge start moving above 195 degrees and the AC starts blowing hot. I also noticed this same problem on my 2000 Yukon XL and figured it was normal. One would think with a newly redesigned vehicle for the Millenium, and after a few model years the engine design dept would figure a fix for this issue. If you or anyone experienced such a problem, what would cause this problem, and how would I be able to fix this?

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  • volsman Jul 09, 2008

    have same problem gmc 2003 yukon overheats when ac on. replaced water pump thermostat fan clutch ac compressor any suggestion. please!!!!!!!!!

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On GM vehicles they still use clutch fans and when sitting at an idle for a while the fan is not pulling enough air through the radiator and condensor so therefor the a/c starts to put out warmer air and the coolant temp. will rise a little bit. You could try replaceing the fan clucth and see if that helps any.

Posted on Jun 11, 2008

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