SL500 (R230) (2003) Heater problem

starlight

Active Member
Joined
Nov 27, 2015
Messages
93
Location
Scotland
Car
C220 Bluetec Sport Premium Automatic (W205) (2015)
It's only possible to get hot air through the system either by (a) using the demist button or (b) turning the temperature dials right up to the red dot.

Any ideas as to what's causing the heater not to function properly otherwise?
 

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