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A lack of water in your cooling system will cause your 2002 Pontiac Sunfire to overheat. A malfunctioning thermostat can also cause it to overheat.

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9y ago
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16y ago

Low coolant?

Cooling/clutch fan not working?

Water pump not circulating coolant?

Radiator plugged or restricted?

Defective radiator cap?

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9y ago

It could be a bad fan clutch. If the fan clutch goes bad it could cause it to overheat while idling, but it would cool off when driving due to the wind going over the radiator.

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14y ago

Check if there is coolant and if fan is on, if not: Possible stuck thermostat Possible missing fan shroud Possible bad water pump

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11y ago

Low coolant, inoperative radiator fan, restricted radiator, failed water pump, etc.

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Q: Why does 2000 jeep run hot at idle?
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