Question about 2001 Pontiac Sunfire

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Sunfire overheating, not low on coolant

Sunfire temp. gauge went all the way to H(Hot) while idling in traffic (twice now)on hot days. Cooling fan does not seem to be running and coolant is not low. What runs the fan?

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Sensor on the engine sends info to the computer that triggers fan relay and sends power to fan. Most often problem is sensor or relay but quick check fan itself by hot wiring it to the battery Polarity is not an issue...if you get wrong it will run backwards. If it does not run, it's bad.

Posted on Jul 30, 2009

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Look at the main fuses.Alot of cars fans run off them.Its useally under the hood.Most of the times there on the right side above the finder well.

Posted on Jul 30, 2009

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Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.

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