Question about 2003 Chevrolet Silverado 1500

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03 silverado overheats while sitting with A/C on. Fan is working and coolant is full. It only overheats when A/C is on.

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  • Chevrolet Master
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That is common since the a/c condenser is in front of the radiator. It may just be time for you to service the cooling system. If you have the orange antifreeze in your system, there only good for 5 years or 150,000 miles and then it needs to be flushed out and replaced with new antifreeze. Make sure the new antifreeze has a 50/50 mix (antifreeze/water) to much antifreeze will gel up when heated causing poor heat transfer and to much water will boil over. Water has great heat transfer but boils at 100C' so antifreeze is added. Service the cooling system for now, don't worry about the thermostat till you change the antifreeze unless you want to replace it too.  Good luck and keep me posted.

Posted on Jun 26, 2009

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