2004 GMC Savana Van Owner's Manual - Page 144

Rear Heating System Your vehicle may have a 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. Rear Air Conditioning and Heating System Your vehicle may have a rear heating and air-conditioning system. This system regulates the temperature, the fan speed and the air delivery for the rear-seat passengers only. It also works with the main climate-control system in your vehicle. Front Climate-Control Panel Use this control panel when you would like to maintain a separate temperature setting. Adjust the direction of the airflow or adjust the fan speed for the rear-seat passenger(s). AUX (Auxiliary Heating System): The thumbwheel for this system is located to the right of the audio system. 9 (Fan): Turn the thumbwheel up or down to increase or decrease the amount of heated air sent to the rear-seating area. 9 (Off): Turn the thumbwheel to this position to turn off the rear heating system. 3-22