Bjbpe

Doctor Bob and jpitman2 both gave me some pretty specific information about the temperatire sensor that controls heat in my 87 S4 cabin. They also indicated that the wires are color coded (see my other thread called "Air Conditioning while it is snowing out").

Does anyone have photos of this area and an explanation of the color codes. Also, how to determine if the temperature sensor has gone south or if it is just corroded wires, etc.

Thanks all. In fact, it is snowing here in Wyoming. Being a very old and rickety skier, that's fine with me.

Mrmerlin

there are two sensors one in the front fender
and the other in the console behind the round grate next to the air outlet in the center of the console

Mrmerlin

with pictures on how to repair the outside temp sensor,
NOTE this is the one thats usually not working so start here first.

https://rennlist.com/forums/928-foru...highlight=HVAC

James Bailey

Even with faulty sensors the heat and ac should function on full hot/ full cold. Often the outside sensor is missing has fallen off.