Question about 1999 Chevrolet Silverado 1500

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It heats up while the ac is on and the truck is at a stand still. if the truck is in motin , it does not heat up. note: the truck does not heat up if it is idleing with the ac off.

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The problem is that there is not enough air being pulled through the AC condenser and the radiator when the vehicle is not in motion and with the engine running, and most likely either the AC condenser and radiator are plugged up with dirt and dust, or the fan clutch is going out, or they both could be the problem.

Also be sure that the air dam is in place and directing the air flow through the AC condenser and the radiator, and that the fan shroud and air dam are not missing or damaged.

Posted on Sep 11, 2010

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The condenser in front of the radiator puts off a lot of heat when in use. If the coolant level and specific gravity is correct, the radiator needs to be checked for sufficient flow. Being almost 12 yrs old there is probably a lot of build up in the core.

Posted on Sep 11, 2010

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