300E-heat always on!
A friend is having trouble with his 1989 300E. The heat seems to come on for no reason (out of defrosters and side vents) regardless of which (or any for that matter) buttons are pushed on the control panel or what the temp. wheel is set at. The air coming out is very hot. The AC will work and eventually over come the heat but often the only way he can stop the heat is to shut the car down. It happens every 2nd or 3rd time he is in the car.