W211 no warm when hot outside???

4life211

Active Member
Joined
Jul 14, 2015
Messages
301
Car
mercedes 211
Hello people .

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

AMGeed

MB Club Veteran
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Joined
Nov 1, 2008
Messages
15,448
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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