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The cooling fan is electric and the sensor reads that your car is hot. It stays on, even when the car is off so that it can cool your engine to acceptable temperatures. If it didn't, and the car remains too hot, it can warp parts and destroy your engine.

If the fan runs for an exceptionally long time, and drains your battery giving you a no start or weak battery slow start condition, you may have a bad cooling fan relay.

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Q: Why does the Cooling fan stay on for so long after you turn the car off?
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