W126 V8 aircon, cooling fans

Discussion in 'Engine' started by Llewelyn, Jun 19, 2017.

  1. Llewelyn

    Llewelyn Hardcore MB Enthusiast

    Messages:
    165
    Joined:
    Sep 10, 2010
    Car:
    S210 320CDi D6
    On Sunday, it was nastily warm and so I was using the aircon. On arriving in town and parking up in the supermarket, noticed the temp gauge sitting higher than normal, not up to the red, but about 20° warmer than normal.

    investigation under the bonnet showed neither of the electric fans doing owt. They're both free to spin (not seized) so any hint where to look for the thermo switch which, I would have thought, should have cut them in at that temperature?
     
  2. ianrandom

    ianrandom Hardcore MB Enthusiast

    Messages:
    998
    Joined:
    Feb 19, 2010
    Location:
    Berks mainly, UK. Devon too a lot of the time.
    Car:
    1986 420SE, 1990 420SEC, 1989 2CV6.
    They don't cut in until quite scary hot. Think it's about 110celcius or something similar.
    Unless the aircon pressure reaches a certain threshold and they'll trigger for that.
     
  3. OP
    OP
    Llewelyn

    Llewelyn Hardcore MB Enthusiast

    Messages:
    165
    Joined:
    Sep 10, 2010
    Car:
    S210 320CDi D6
    Hmmm maybe just wasn't hot enough then. It normally runs half way up the gauge, was up to about 3/4 - but that likely isn't up to 110°C, I would reckon that's almost up to the red.
     
  4. ianrandom

    ianrandom Hardcore MB Enthusiast

    Messages:
    998
    Joined:
    Feb 19, 2010
    Location:
    Berks mainly, UK. Devon too a lot of the time.
    Car:
    1986 420SE, 1990 420SEC, 1989 2CV6.
    Yeah no idea why they have it set so high. I only discovered my fan wasn't working when it went into the red one day in traffic. New radiator was needed. Found the fan was seized, it did free up fine but I had to fit a manual switch in the glove box cos couldn't get it to trigger itself.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.