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Thread: Which sensor controls the electric fans?

  1. #1
    Senior Member
    Join Date
    Sep 2004
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    525

    Which sensor controls the electric fans?

    The electric fans in front of the radiator are running all the time now. I suspect the sensor may be out. Which sensor controls them?

    '96 C36, BTW.

    TIA!

  2. #2
    Senior Member
    Join Date
    Nov 2004
    Posts
    1,757
    is your a/c on all the time?
    the sensors that control them are the coolant temp sensor and the a/c press sensor. however, the most likely culprit to your problem might be the relay. but try unplugging each sensor one by one and see if the fans turn off, if not then one of the aux fan relays is sticking and needs to be changed(unplugging the coolant temp sensor will most likely activate CEL, so make sure you can reset it).

    nenad
    2002 S500
    2002 CLK430 w/ 5.5L swap
    2002 SLK32 AMG
    2003 S430 w/ 5.0L swap
    2000 ML55 AMG

  3. #3
    Senior Member
    Join Date
    Sep 2004
    Posts
    525
    Thanks for the suggestions! I will post the results when I have tried them.

    And the results are in:

    The culprit was a loose connection on the climate control unit. All seems well now. Thanks for help, your suggestions pointed me in the right direction.

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