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Most modern cars have electric fans which are designed to operate only when the engine is nearing the boil-over point. Cooling is accomplished most of the time by air moving through the radiator as a result of the vehicle's velocity. When sitting in traffic, or climbing a hill, the fan should operate when the coolant temperature reaches a preset value.

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Q: If you have a 2000 Chevy Malibu and the engine fan is not coming on only when the engine is overheated What could be the reason?
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