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Assuming you have electric fans, and the engine isn't hot enough for them to engage at the point when they're supposed to, the problem most likely lies in your thermal sensor.

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Q: What causes coolant fans to kick off and on when the key is turned over but the car isn't running?
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Why are the fans running on a Oldsmobile alero 2000 when the car is on?

to cool the coolant in the engine


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