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Q: Why would a car run hot when the AC is on even though the water pump and thermostat have been replaced?
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What would cause a 2002 2500 HD to over heat you have replaced the thermostat already?

water pump


Why would a Honda civic ex 95 overheat if you replaced the thermostat?

because the water pump is not working properly....


Why would a van overheat after changing the thermostat and water pump?

Assuming it did not overheat before you replaced thermostat and water pump you may have installed the thermostat backwards. It is also possible the cooling system wasn't refilled properly and was air bound.


What will make your car over heat have already installed new water pump and thermostat?

Would need to know if car was overheating before waterpump and thermostat was replaced.


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I had the same probl;em on my 1996 SL1. I found the bypass tube from the head to the reservoir was clogged and would not let water return to the reservoir. When I unclogged the line the overheating went away. I also had replaced the water pump and thermostat before without any luck. The clogged line was the culprit.


You have replaced the water pump and thermostat still showes overheating?

Year, make and model would help us help you.


What would cause a 2000 Plymouth Neon to overheat when you have replaced the thermostat twice and the sending unit?

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How do you know if your car thermostat is broken?

If the thermostat is broken in the closed position the engine would overheat rapidly. If it was broken in the open position the engine cooling system would not reach normal operating temperature and the heater would produce only warm air. Take the thermostat out and put it in a pan of water on the stove. When the water gets to around 200 deg F, the thermostat should open. If it doesn't it needs replaced. Observe carefully that you have not installed the thermostat upsidedown.


Why would a 98 GMC Jimmy have little or no heat even after the thermostat was replaced?

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Water heater thermostat defective?

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