Temperature Control Lever
WARNING: This page is about a different car, the 1994 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
Temperature control lever operates a blend-air door by electronic actuator on heater evaporator case. Blend-air door directs air around and/or through heater core to control temperature of discharged air. All air passes through evaporator core. See Figure.