W210 Radiator Fan Running ignition off

Discussion in 'Electronics' started by qwiksand, Apr 25, 2011.

  1. qwiksand

    qwiksand New Member

    Messages:
    6
    Joined:
    Nov 1, 2007
    Location:
    Never Land
    Car:
    E320 CDI W211
    Hello,

    I have a 2001 W210 E220 CDI which has not been used much lately. The radiator fan has spontaneously started spinning ( and consequently drained the battery ) while the car was sitting locked - the only way to stop the fan has been to disconnect the battery OR disconnect the power supply at the fan itself.

    I am looking for suggestions of the source of this problem is it likely to be a failed/failing relay? Can someone point me at the appropriate relay(s) and I can try swapping them out.

    Cheers

    :dk:
     
    Last edited: Apr 25, 2011
  2. rhjcamp

    rhjcamp Active Member

    Messages:
    60
    Joined:
    Apr 13, 2008
    Location:
    Essex
    Car:
    R-Class, & R171
    Hi, did you ever find out the answer? I have the same problem! Mine, I think is related to the fact that I accidentally spilt about 8 litres of water all other the boot and the rear relay fuse board! Ta
     
  3. mersum1es

    mersum1es Hardcore MB Enthusiast

    Messages:
    1,252
    Joined:
    Aug 9, 2012
    Location:
    Finland
    Car:
    W219, W220
    Running fan is due to lack of voltage either fan acu or engine ecu. Check all fuses first, and all wire connections.
     
  4. horgantrevor

    horgantrevor Hardcore MB Enthusiast

    Messages:
    1,902
    Joined:
    Jan 14, 2011
    Car:
    w202 c43 & w210 E220 CDI estate w219 W221
    I had a fault on same car it was due to implausible signal at brake light switch
    And i found a dirty connection for fan
     
  5. rhjcamp

    rhjcamp Active Member

    Messages:
    60
    Joined:
    Apr 13, 2008
    Location:
    Essex
    Car:
    R-Class, & R171
    Seems to be fixed with a large amount of electrical cleaner spray, mopping out boot and re-charging the battery! Hint to self, check before putting a garden roller in you boot for leaks!
     

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