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mercedes cdi c220

Discussion in 'General Mercedes-Benz Related Discussion' started by ukace58, Apr 15, 2018.

  1. ukace58

    ukace58 New Member

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    hi can anyone help , my 2004 c220 will only blow warm air at low fan settings if I turn it up its just blows cold air, I have changed the thermostat and flushed the cooling system replacing the coolant.
    just need to no are there any valves or pumps that cause this , the car runs fine temp all ways around about 80 .
    cheer Steve
     
  2. mercedes13156

    mercedes13156 Senior Member

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    Location:
    West Lothian
    Your Mercedes:
    CLK 200 Cabrio and a Ford Kuga
    That could be the duo-valve. it sits in the driver's side of the engine bay in front of the brake master cylinder, with two smallish pipes at the front. I can't remember its actual function, but on a previous C Class, the heating went wonky and I was advised to clean the duo-valve in case some previous application of Radweld, or similar sealing compound had started to jam it up. That was indeed the case and once it was cleaned and put back together, (a bit of a fiddly job if I recall), it all worked wonderfully again.

    Once I had been told of the potential problem, I gave it a couple of donks with the back end of a large spanner. That improved things a bit and told me that I was on the right track. Stripping it and rebuilding it solved it for me. Just don't rip it out and strip it down without being sure you've got the true culprit.
     
  3. alexanderfoti

    alexanderfoti Moderator

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    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG
    No duovalve on the 203. Its probably a flap problem. Does the car click from the dashboard when you turn the ignition off
     
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  4. mercedes13156

    mercedes13156 Senior Member

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    Your Mercedes:
    CLK 200 Cabrio and a Ford Kuga
    Thinking about it, it must have been on my old W202, not the 203. Please disregard my previous post.
     

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