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most common answer. Its because your electric fan is not turning on when it reaches the required temp. Meaning that perhaps, the fuse is blown, the fan is broke, or a wiring issue. quick fix. cut the hot wire from the fan and wire it to some thing that goes hot when you turn on the ignition, until you are able to fix the thermostat on the fan located some wheres on the radiator. draw back, fan runs all the time. but i have yet to see how thats a problem.

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Q: Why is it when you are sitting in your 99 Pontiac sunfire it starts to run hot?
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