Question about 2002 Jeep Grand Cherokee

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What would cause the fan to stay on after the engine is turned off?

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  • Jeff Turcotte
    Jeff Turcotte Nov 07, 2010

    possibly a shorted relay. pull out the fan relay and swap it with the horn relay. If the fan relay makes the horn blow, get a new relay.

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  • 228 Answers

The fan is probably ran from an engine coolant temp sensor, which would cause that.but if it stays on for a long period of time{like 30 min} after the engine is off, the sensor could be bad

Posted on Nov 07, 2010

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Most modern vehicles using an electric cooling fan have a thermostatic switch that will allow them to run even after the engine is turned off. Start and stop driving can cause heat buildup in the block which can cause problems such as the one you have and if the fan isn't bringing the excessive heat down during a stop, the hot engine can refuse to idle or accept fuel as it should.
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