Temperature Control Knob
WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford F-Super Duty, 1995 Ford Cab & Chassis, and 1995 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
Temperature control knob operates a cable to adjust temperature blend door in plenum assembly. When temperature knob is in cool position, temperature blend door shuts off airflow to heater core. When knob is in warm position, air is directed through heater core. When knob is in intermediate positions, heated air is blended with cooler incoming air to achieve desired temperature.