Question about 1999 BMW 323 Series

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Cooling system (radiator) fan won't turn off, car has not overheated. It does not turn off at a certain temperature it only turns off when my battery has finally had enough and died. We have unplugged it so it's not running, what is the problem?

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  • apolinarangi Apr 22, 2010

    Thank you,

    Your solution sounds simple enough, the local BMW auto service (whom has not seen the car) says we need the complete fan motor, is the relay and sensor included in the motor?? Appreciate your help.

  • apolinarangi Apr 23, 2010

    You are a blessing, thank you so much!!!!
    I'll let you know how things go.

    Gratefully yours,

    Angie

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  • Master
  • 3,489 Answers

This is most likely due to a faulty temp sensor which screws into the radiator. Once this cools down it should open the circuit and allow the relay to open as well. If the sensor is constantly closed it will close the relay and keep the fan on thus draining the battery. I would replace the relay and sensor assembly due to high heat while these systems are running. The sensor should be nearest the fill neck on the radiator. Let me know if you need anything else.

Posted on Apr 22, 2010

  • Kori Policy
    Kori Policy Apr 23, 2010

    No! The fan motor needs electricity to activate right?! What controls this and acts as control points or gates (open or close to allow flow) is the sensor which closes when it reaches a certain temperature and then the relay simply takes that signal and closes the 2 points to activate the fan. These are going to be your 2 items to replace. A fan motor doesn't just run on because it is faulty. If it is faulty, it either will make noise or not work at all. The fan motors for these are about $400 plus labor.

  • lazrobles
    lazrobles Jul 26, 2012

    i replaced the sensor and the relay and it is the same.

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