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ML windscreen not demisting

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Topboy, Nov 30, 2012.

  1. Topboy

    Topboy Senior Member

    Messages:
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    Joined:
    Dec 19, 2004
    Location:
    Plymouth - In The Glorious South West
    Your Mercedes:
    2014 SLK 250 AMG & 2002 ML270CDI (for the Mrs)
    Morning all,

    Took the Mrs's ML out last night and the windscreen would not demist.

    Heater seems to be working fine but just not blowing up to the windscreen. I shut all the other vents but still not blowing up. Heat seems ok and it'll blow through the other vents into the car.

    Any clues where to start looking?
     
  2. whitenemesis

    whitenemesis Senior Member

    Messages:
    17,978
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    Joined:
    Dec 21, 2006
    Your Mercedes:
    CLS55 AMG '05
    Did you press the screen demist button? Are you running with the a/c On? When was the cabin air filter last changed?
     
  3. OP
    Topboy

    Topboy Senior Member

    Messages:
    76
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    Joined:
    Dec 19, 2004
    Location:
    Plymouth - In The Glorious South West
    Your Mercedes:
    2014 SLK 250 AMG & 2002 ML270CDI (for the Mrs)
    Hi,

    I tried everything I could think of. I had the screen demist running then I tried with the aircon, then just the blowers on full.

    Not sure when the cabin air filter was last changed as I've only had the car for three months. It was serviced before I got it, but what was done I really don't konw.

    Where is the cabin air filter located? I'll have a look and see if it looks clean.
     
  4. whitenemesis

    whitenemesis Senior Member

    Messages:
    17,978
    Likes Received:
    22
    Joined:
    Dec 21, 2006
    Your Mercedes:
    CLS55 AMG '05
  5. OP
    Topboy

    Topboy Senior Member

    Messages:
    76
    Likes Received:
    0
    Joined:
    Dec 19, 2004
    Location:
    Plymouth - In The Glorious South West
    Your Mercedes:
    2014 SLK 250 AMG & 2002 ML270CDI (for the Mrs)
    Thanks WN.

    I've removed the filter and it looks pretty clean.

    Having done a bit of a more indepth google search it seems a fairlycommon fault for the ML to have problems with the Vent Actuator either missing teeth and not opening certain vents or for the vents to come loose. Either way, it looks like a dash out to investigate further.

    Time to ring my mechanic mate!

    Unless anyone knows better?
     

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