W202 Heater temperature unstable.

Discussion in 'Interior' started by GadgetBoy, Sep 11, 2011.

  1. GadgetBoy

    GadgetBoy Hardcore MB Enthusiast

    Messages:
    140
    Joined:
    Aug 19, 2011
    Location:
    Belfast, N. Ireland
    Car:
    ML320 and CLK200K Cabrio
    Had the car a few weeks now. Got the A/C recharged, it needed it badly.

    Now I can't get the heater to sit at a stable temperature. A nanometre change in the temperature control seems to go from fantastically hot to fantastically cold or vice-versa. Even looking at the temperature control sternly causes this disconcerting effect.

    It's the manual control version with the two temperature controls. Any ideas?
     
  2. horgantrevor

    horgantrevor Hardcore MB Enthusiast

    Messages:
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    Joined:
    Jan 14, 2011
    Car:
    w202 c43 & w210 E220 CDI estate w219 W221
    check the control valves two of them under the bonnet
     
  3. OP
    OP
    GadgetBoy

    GadgetBoy Hardcore MB Enthusiast

    Messages:
    140
    Joined:
    Aug 19, 2011
    Location:
    Belfast, N. Ireland
    Car:
    ML320 and CLK200K Cabrio
    Will do.

    The thing is. If I leave the temp dials in one place one day I get cold air out and the next I get warm out, next day it might be warm, it might be cold. Completely random.

    So I would think the valves are working but whatever controls them is a tad confused.
     
    Last edited: Sep 11, 2011
  4. horgantrevor

    horgantrevor Hardcore MB Enthusiast

    Messages:
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    Joined:
    Jan 14, 2011
    Car:
    w202 c43 & w210 E220 CDI estate w219 W221
    the valves near the brake servo drivers side have electrical solenoids check the wires but these valves are the most common fault

    other then that get the codes read fastest way
     
  5. OP
    OP
    GadgetBoy

    GadgetBoy Hardcore MB Enthusiast

    Messages:
    140
    Joined:
    Aug 19, 2011
    Location:
    Belfast, N. Ireland
    Car:
    ML320 and CLK200K Cabrio
    Righty ho.
     

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