GMC YUKON XL 2004 Owner's Manual page 196

Fan Knob
The fan 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 the off position.
9 (Off): An off setting, located on the front climate
control panel also allows the driver to turn off the
rear seat passenger seat controls from the front seat.
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.
H
(Vent): This setting directs the air through the
headliner outlets.
3-36
)
(Bi-Level): Air is delivered through the floor outlets
as well as the headliner outlets. The flow can be
divided between vent and floor outlets depending upon
where the knob is placed between the settings.
6
(Floor): This setting directs most of the air through
the floor outlets.
Rear Controls
To use the rear control, first turn the front control to the
AUX position. Then, the rear control can be used to
adjust the airflow speed, temperature, and airflow
location.