GMC 2002 Sierra - Manual (Page 205)

3-2
Comfort Controls
Standard Comfort Controls
Fan Knob
The knob on the left side of the control panel adjusts the
fan speed. To increase airflow, turn the knob clockwise.
To decrease airflow, turn it counterclockwise. To turn
the fan off, turn the knob to OFF.
Temperature Knob
The middle knob on the control panel lets you select the
temperature of the air flowing into the passenger area.
Turn the knob clockwise toward the red area for warmer
air. Turn the knob counterclockwise toward the blue area
for cooler air.
Mode Knob
The right knob on the control panel allows you to
choose the direction of air delivery.
(Vent): This setting directs the air through the
instrument panel outlets.
(Bi - Level): Air is delivered through the floor
outlets as well as the instrument panel outlets. The air
flow can be divided between instrument panel and floor
outlets depending upon where the knob is placed
between the settings.
(Floor): This setting directs most of the air
through the floor outlets, and the rest of the air is
divided between the windshield defroster outlets and
the side window defroster outlets.
(Blend): Airflow is delivered through the floor
outlets, the windshield defroster outlets and the side
window defroster outlets. The air flow can be divided
between floor and defrost depending upon where the
knob is placed between the settings.
(Defrost): This setting directs most air through
the windshield defroster outlets, side window defroster
outlets and some through the floor outlets.