2003 Chevrolet Express Van Owner's Manual - Page 141

If your vehicle has air conditioning, your heating/air conditioning controls will look like this: Rear Heating System Your vehicle may have an optional rear heating system that allows you to adjust the amount of air flowing into the rear of the vehicle, from the front-seating area. This feature works with the main climate-control system in your vehicle. On hot days, open the windows to let hot inside air escape; then close them. This helps to reduce the time it takes for your vehicle to cool down. It also helps the system to operate more efficiently. (Temperature Control): Turn the center knob clockwise or counterclockwise to increase or decrease the temperature inside your vehicle. A/C (Air Conditioning): This setting will begin to cool and dehumidify the air inside of your vehicle. MAX A/C (Maximum Air Conditioning): Turn the right knob to MAX A/C for maximum cooling. This setting cools the air the fastest, by recirculating the inside air. A v m 0 AUX (Auxiliary Heating System): The thumbwheel for this system is located to the right of the audio system. @ (Fan): Turn the thumbwheel up or down to increase or decrease the amount of heated air sent to the rear-seating area. 0 (Off): Turn the thumbwheel to this position to turn off the rear heating system. 3-18