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There is a heat sensor that allows the fan to stay on after the key is off to cool down the underhood temperatures. If the fan stays on as you have said, the sensor is most likely faulty or shorted.

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Q: Why does your heater fan not the radiator fan keep running as if the car was turned off in your 1994 Jeep with your keys out of the ignition so much to continuously drain the battery what is wrong?
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