GMC 2009 Savana - Manual (Page 139)

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.
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