1989 Other Mercedes Benz Models 6 cyl Two Wheel Drive Automatic 130000 miles
the heater does not blow warm air. When I set the temp wheel to 75 degrees or max warm on a cold day, and set the fan to auto, the fan comes on high but only cold air comes out of the heater vents. After I run the car at operating temp for awhile, then turn off the engine, the heater will blow slightly warm air.
Do you think the " heater temp sensor" is bad, or is there a valve in the engine coolant supply to the heater that may be sticking?
What do you think is the problem and where is the faulty part located and how to access it?
This is my first inquiry to your service.