W211 no warm when hot outside???

Discussion in 'Interior' started by 4life211, Oct 16, 2018.

  1. 4life211

    4life211 Active Member

    Messages:
    293
    Joined:
    Jul 14, 2015
    Car:
    mercedes 211
    Hello people .

    Is it normal when: in summer you open the heater inside and not warming ?
     
  2. AMGeed

    AMGeed Hardcore MB Enthusiast

    Messages:
    13,073
    Joined:
    Nov 1, 2008
    Location:
    Bournemouth/Poole Dorset
    Car:
    2014 E63 Biturbo
    If you have set the temperature on the heater bezel to 20c+ you should have warm air coming from the heater vents within a mile or so.

    If not, I would suspect the heater duo valve needs replacing.

    What temperature is showing on the water temp gauge in the cluster once the engine is up to temperature ( a couple of miles)?
    If its under 80c, suspect the thermostat. I think the new ones open at 87c
     

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