Asked by Jul 12, 2018 at 03:22 PM about the 2002 Pontiac Montana

Question type: Maintenance & Repair

Okay so it's overheating bad and when I drive it or
even rev the engine it cools itself down but if it's
sitting it over heats, if I turm the heat on it over
heats but If I turn the Ac on it cools down, I've
replaced hella hoses and the thermostat 2 times
water pump head gasket isn't blown I'm pretty sure
I'm just really confused please help

3 Answers

Did a pressure test and bled the whole coolent system


Do not know how you bleed system but try bleeding like this. Remove cap from overflow tank fill with antifreeze to full mark leave cap off and start vehicle and let idle once level in tank will start to rise this is normal once thermostat starts to open level in tank will drop add more antifreeze to full mark then put cap back.


Make sure your cooling fan(s) are functioning. If they are not energizing at the right temp, the heat will continue to build (especially if the car is not moving to force outside air over the radiator).

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