Question about 1995 GMC Jimmy

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My Jimmy 1995 Overheat whith A/C On

I notice when A/C is turned on my truck overheat the engine, the same happen when i drive in hills or mountains.

Can anyone help me?


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Is it idicating an actual overheat or is it just running warmer than usual? Do you have a guage or a light? Most vehicles WILLrun hotter with the AC on because the AC condensor is directly infront of the radiator. Some have an auxiliary fan for this. If you do make sure it is running. Start and get the engine up to running temp. With the hood open peek in to see if you have one or two cooling fans. Watch with the AC on that Both are running in cycles.

Posted on Jul 24, 2009


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We borrowed our daughter's Hyundai Santa Fe to make a trip to the mountains on a 105 degree day. It was doing great on mountain highways until we stopped after about 3 hours.

May be a bad fan or thermal switch not working. The a/c condenser sits in front of the radiator. It may be that the load on the engine going up the mountain is too much for just the air blowing across it to keep it cool, and the car shuts the a/c off to try and keep engine temp down. Cruising along on level ground is enough to keep things cool. Going up the mountain means more engine heat and probably reduced speed, which reduces air flow, especially if a fan isn't working.
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