GMC 2002 Savana - Manual (Page 145)

3-6
For warmer air, turn the knob toward the red area, and
for cooler air, turn the knob toward the blue area.
To regulate the location of the airflow, adjust the center
knob on the control panel. Turn the knob
counterclockwise for upper vent airflow or clockwise
for headliner vent air flow. Generally, the upper vents
are used for air conditioning and the floor vents for
heating. The knob can be set to any blend setting.
To adjust the airflow speed, turn the fan knob on the left
side of the control panel to the desired fan speed.
To activate the rear control, turn the fan knob on the
front control to REAR CNTL.
Rear Passenger Control
The rear control works just like the front control. It will
allow second seat passengers to adjust the controls if the
front control is switched to the rear position.