Temperature Control Knob
WARNING: This page is about a different car, the 1999 Dodge Pickup, 1999 Dodge Durango, 1999 Dodge Dakota, and 1999 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Temperature rotary switch controls temperature blend/air door position by a cable on Dakota and Durango, and by vacuum actuator for Ram Pickup. When cold temperature is selected, no air flows across heater core. When hot temperature is selected, all air flows through heater core. Temperature may vary by any setting between cold and hot.