Heaters not blowing hot air

Discussion in 'Electronics' started by emc4raz, Sep 23, 2018.

  1. emc4raz

    emc4raz Active Member

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    Oct 26, 2013
    Location:
    slough
    Car:
    c220 cdi sport coupe
    Hi just put the heaters on my w204 c220 and not hot air comes out whatsover, winters coming need heaters

    Any thoughts why it could do this
     
  2. whitenemesis

    whitenemesis MB Club Veteran

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    Cold engine?
     
  3. Happytalk73

    Happytalk73 MB Enthusiast

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    Low on coolant?
     
  4. Ted

    Ted MB Enthusiast

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    Thermostat gone?
     
  5. clk320x

    clk320x Hardcore MB Enthusiast

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    Faulty climate control unit? (Unit where you select temperature/fan speed etc.)
     
  6. mercmancdi

    mercmancdi Active Member

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    mercedes E320 cdi sport ,vw Tiguan R line , M B cls , bmw convertible
    Start with cheapest , see if thermostat is stuck open.
    Also what’s the temp reading
     
  7. OP
    OP
    emc4raz

    emc4raz Active Member

    Messages:
    68
    Joined:
    Oct 26, 2013
    Location:
    slough
    Car:
    c220 cdi sport coupe
    Car will be at 80 -90deg, i have tried various settings on the heater control, coolant has been topped up
     
  8. OP
    OP
    emc4raz

    emc4raz Active Member

    Messages:
    68
    Joined:
    Oct 26, 2013
    Location:
    slough
    Car:
    c220 cdi sport coupe
    literally no hot air at all, just cold
     
  9. Major774

    Major774 MB Enthusiast

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    Car:
    W211 E55 AMG
    Sounds like you have air in the coolant system and just need to bleed it.

    Not sure how to bleed the system on a Mercedes at the moment.
     
  10. grober

    grober MB Master

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    [​IMG]
    The W204 heater/ air con system has an auxilliary heating matrix which should power up until the engine has reached heater operating temperature? Could be the sensor/ element / fuse /relay /controller.
    Pre heater element
     
  11. OP
    OP
    emc4raz

    emc4raz Active Member

    Messages:
    68
    Joined:
    Oct 26, 2013
    Location:
    slough
    Car:
    c220 cdi sport coupe
    so i did also notice the temperature hovering around 60deg and than going back up to 90
     

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