CLK 2.7 diesel - heater is poor

Discussion in 'Engine' started by reggie musson, Oct 10, 2011.

  1. reggie musson

    reggie musson Active Member

    Messages:
    192
    Joined:
    Feb 13, 2011
    Car:
    CLK 2.7 Diesel
    Hi everyone, could anyone help or advise me if I have a fault with my 2004 2.7 Diesel CLK interior heater, as very little warm air comes out when its set to the maximum heat once the engine is warmed up and I am not looking forward to a very cold winter.

    Thanks, Reggie
     
  2. sheepy67

    sheepy67 Active Member

    Messages:
    262
    Joined:
    Aug 14, 2011
    Location:
    birmingham
    Car:
    porsche cayenne turbo
    i had this on my CLS, turned out to be a £20 part, but buried in the engine, took hours to fix, Acid at MSL fixed it for me, Brabus K8 on here. Get a Star diagnostic on it if you know someone with one
     
  3. Chrishazle

    Chrishazle MB Enthusiast

    Messages:
    3,577
    Joined:
    Nov 13, 2008
    Location:
    Nr Ashford, Kent
    Car:
    2008 S204 C220CDI Elegance Estate Auto, 2008 R171 facelift SLK280 Auto.
    First thing to check is that your engine is getting up to proper temperature - scroll through the screens with the buttons on the steering wheel, one of them is engine temperature. I had the same problem when I first bought my S203 C270, engine temp was only getting to 60C instead of 80-90C - had the thermostat changed, problem solved - and a side benefit was an increase in MPG from 40+ to 45+!!
     
  4. jaymanek

    jaymanek Authorised Forum Sponsor Authorised Forum Sponsor

    Messages:
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    Nov 29, 2002
    Location:
    Nuneaton Warwickshire
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    Lots of Mercedes!
    Yes its the duo valve as mentioned above.. but a real pain to fit... much more common on W211 though, dont think we have ever done one on a 209.
     
  5. Alex Crow

    Alex Crow Active Member

    Messages:
    278
    Joined:
    Sep 30, 2011
    Location:
    Super Suffolk
    Car:
    S210 320cdi
    No duovalve on a 209, so not that.

    As said above, check engine runnign temp.

    Also, hard to be sure from reading the original post, but is the blower supplying sufficient air flow??
     
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