1991 Mercedes-Benz 300SEL Q&A
1991 Mercedes-Benz 300SEL Question: Where are the the heater core and the control valve on this vehicle?
The car was chilly on the trip south from Idaho in zero degree weather. The coolant is up to level. The blower is magnificent. The heater hoses are hot. The engine temperature is 85 degrees centigrade. It seems that either a door is closed or a control is stuck somewhere within all the wrappings. - oej
I am not sure if this car has a heater valve, so follow the heater hoses up to the heater core to locate it. Often the climate control head goes out on this vintage Mercedes, so that is something to check. As far as dealing with the heat control door operation, that can be a huge job, you have to remove the dash to get full access, which is a 10-12 hour job for a Professional Tech. - dandd