w639 ecu fan runs constantly..normal?

Discussion in 'Electronics' started by mauzeri, Apr 24, 2014.

  1. mauzeri

    mauzeri New Member

    Apr 24, 2014
    Vito 115cdi 2004
    Hi and greetings from Finland!:bannana:

    My ECU fan is running constantly, it never stops, even after the car has been sitting still for a good day or two, keys out of ign., doors locked, i can hear the fan running..
    and yes i'm sure it's the ECU fan since i found the fan from the bottom of the electronics box..two wires going to the fan..sticked my finger there and felt it spinning :rock:..
    Is it really supposed to permanently cool the ECU?? How it should work?

    Thanks in advance!
  2. stoked1

    stoked1 New Member

    May 12, 2014
    2004 Mercedes Vito 115CDI
    Hi there, I have exactly the same problem - some days it goes off about 5 min after the key leaves the ignition, other days it flattens the battery. I'm tryingto find how to disable it, or even hook it up to the ignition key "on" wire so it only runs when needed.

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