GMC 2002 Savana Van Owner's Manual page 144

Rear Heater (Without Air Conditioning)
(If Equipped)
If you have a rear heater (without rear air conditioning),
the thumbwheel for this feature is located on the
instrument panel.
To increase and decrease the flow of heated air to the
rear floor vents, turn the thumbwheel marked HEAT to
the desired fan speed.
The thumbwheel has three positions. To increase the
flow of heated air, turn the thumbwheel toward HIGH.
To turn the fan off, turn the thumbwheel to OFF.
Rear Air Conditioning and Rear Heater
(If Equipped)
If your vehicle has a rear air conditioning and rear
heater system combination, controls are provided
to regulate the temperature, location and speed of
the airflow.
Front Passenger Control
To adjust the air temperature, turn the temperature knob
on the right side of the control panel.
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