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R-Class 320 heating system

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Motzil, Nov 9, 2019.

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  1. Motzil

    Motzil Member

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    Joined:
    Apr 28, 2019
    Your Mercedes:
    R-Class 320 CDI 2009 SWB
    Hi need a little advice got a 2009 R-class now the weather’s taken a turn for the worst. Set the heater control to max and blower on medium. Clears the windows when frozen brilliantly.

    But some 20 minutes later the heater is not as hot as I would expect it to be. I’ve checked to make sure there is plenty of water in the header tank, which there is. Only had the car since April. So heater controls have been set to cool looked in the manual and setting seem to correct.

    I’m I missing something here, or is there another underlying problem that I need to be checking

    many thanks in advance

    after reading a few more post it appears my car could have a heater control valve connected to the heater matrix at the bulkhead. Is there a way to test this..?
     
    Last edited: Nov 9, 2019
  2. mioba

    mioba Senior Member

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    Joined:
    Feb 19, 2006
    Location:
    Nottingham
    Your Mercedes:
    W124/1994/E200, W220/2004/S320CDI, W205/2016/C200, W447/2017/3.0 CDI
    If the AC system is on auto, once things have reached temp, the air flow and temp will reduce. Doesn't sound like anything wrong to me
     
    EmilysDad likes this.
  3. OP
    Motzil

    Motzil Member

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    Your Mercedes:
    R-Class 320 CDI 2009 SWB
    Many thanks for the reply mioba I will check it out. May just be me now that its come cold all of a sudden. Will check it out over the next week. I take that if I take it off auto and set the temp to 28 on both sides it should get hot within 20 mins
     
  4. LostKiwi

    LostKiwi Senior Member

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    Location:
    Midlands / Charente-Maritime
    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    Check your engine temperature. Cold engine = cold heater.
     
  5. EmilysDad

    EmilysDad Senior Member

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    Location:
    Bury Lancs
    Your Mercedes:
    ML350
    You can set it to what ever temp you like & still leave it in AUTO :)
     

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