My '98 Club Wagon has heating, venting, and air conditioning. When running the heater or vents, the air is maximum-hot all the time. Until recently, we could regulate the temperature by turning a dial in the center of the dash board.
I have a CDROM service manual for this vehicle, and I can readily see the generalized descriptions of how flaps are arranged, depending on whether one is using the heater, vents, a/c, and whether the temperature dial is set to cold, medium, or high. The problems in troubleshooting are many, though. First of all, it is very difficult to access either the dial or the heat exchanger. So unlike an old truck with lots of room under the hood, this vehicle is nearly impossible to casually inspect.
I first assumed the temp dial was purely mechanical, with a cable directing the extent to which a "hot air" flap would be moved in the heat exchange plenum. However, the dial sweeps perhaps 300 degrees, which would be hard to accomplish with an old-fashioned mechanical linkage. So can anyone corroborate that my temperature dial is a potentiometer?
If I have a potentiometer as a hand-controlled dial, then the heater flap must have a rather fancy actuator. Any descriptions would be most appreciated.