How does the radiator fan know to come on?

Updated: 4/28/2022
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15y ago

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Most often there is a temperature sensor that tells the fan to run or not: above 165F (in a lot of cases) the fan goes on, below that it is off to allow the engine to warm up to running temperature. It varies from car to car and even day to day based on readings that the cars computer takes in running the engine.

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Q: How does the radiator fan know to come on?
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