Why does the radiator fan run even when the cars not started

Asked by madolyn Jun 09, 2012 at 08:48 PM about the 2002 BMW 3 Series 325i Sedan RWD

Question type: Maintenance & Repair

Air doesn't blow cool, radiator fan comes on when the cars not running.

5 Answers
24,735

aztec626bf answered 12 years ago

If it's coming on even when the engine is cool you most likely have a relay issue to the fan or a control issue to the relay.

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Hector answered 12 years ago

Check your temp sensor to see if it's working correctly

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LarchmereImports answered 12 years ago

The fan on that vehicle is digitaly controlled by the vehicles DME if the fan is running all the time even with the vehicle off then te fan module (fan assembly itself) is faulty

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GuruRGJZ6 answered 4 years ago

I have a BMW e46 my fan runs non stop even when the car if off as a result my battery is dead, I had to disconnect the battrey but every time I connect the battrey it comes on again

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Keith answered 4 years ago

I got the same issue this morning after installing a new stereo. I did not have to cut or splice in wires but once I reconnected the battery the fan came on even though the car was not on. Even when I start the car and try to adjust the fan it is not responding to the controls.

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