Temperature Control Selector
WARNING: This page is about a different car, the 1999 Dodge Intrepid and 1999 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
Temperature selector controls a potentiometer (POT), which signals temperature (blend air) door actuator. Changes in voltage across a resistor changes door position through full range of hot and cold. Clockwise rotation increases temperature setting. Counterclockwise rotation decreases temperature.