Hi guys, I’ve got a 2010 cls grand edition with heater troubles. It may just be a coincidence but in the mornings going to work the heater works fine but coming home it’s just blowing out cool air, Any ideas? Cheers in advance
Is the engine temperature stable? Could be thermostat, or like the problem I had in an old audi a4, blocked heater matrix.
Could also be a sticky heater flap motors.