GMC 2001 Sierra 1500 Pickup Owner's Manual page 190

Heater and Air Conditioning Comfort
Controls (If Equipped)
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.
PANEL: This setting directs the air through the
instrument panel outlets and the center floor console
(if equipped).
-
BI LEVEL: Air is delivered through the
instrument panel outlets and center floor console outlets
(if equipped) as well as the heater floor outlets. The air
flow can be divided between PANEL and HEATER
depending upon where the knob is placed between the
settings. Pressing the A/C button while in this mode
causes cooler air to come out of the instrument panel
outlets and center floor console outlets (if equipped)
and warmer air to come out of the heater floor outlets.
HEATER: This setting directs most of the
warmed air through the heater floor outlets and center
floor console outlets (if equipped), as well as some
air through the windshield defroster outlets and side
window defroster outlets. If air from the center floor
console outlets is not desired, turn the vents off at
the console.
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