Temperature Control Lever
WARNING: This page is about a different car, the 2001 Suzuki Vitara, 2001 Suzuki Grand Vitara, 2000 Suzuki Vitara, and 2000 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
The temperature control lever mechanically controls a damper door, regulating the volume of air going through or by-passing the heater core. This blending of warm and cool air from the evaporator controls the temperature of air entering passenger compartment.