2005 GMC Savana Van Owner's Manual - Page 135

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 HEAT: 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. HI: Turn the thumbwheel to this position to supply the most amount of heat to the rear-seating area. LO: Turn the thumbwheel to this position to supply the least amount of heat to the rear-seating area. OFF: Turn the thumbwheel to this position to turn the rear heating system off. 3-21