2010 GMC Savana 2500 Cargo Owner's Manual - Page 164

Rear Heating System For vehicles with a rear heating system, it lets you 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 the vehicle. AUX: The thumbwheel for this system is located in the switchbank below 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. Q (High): This position supplies the most amount of heat to the rear-seating area. c (Medium): This position supplies half the amount of heat to the rear-seating area. R (Low): This position supplies the least amount of heat to the rear-seating area. 9 (Off): Turns the rear heating system off. 4-18