GMC Chevrolet Tahoe 2003 Manual page 199

The overhead control has three knobs that control
airflow speed, temperature and airflow location.
To adjust the airflow speed turn the knob located on the
left side of the control panel. To adjust the air
temperature turn the temperature knob on the center of
the control panel to increase or decrease the
temperature. To regulate airflow location adjust the right
knob on the control panel.
The system also AUTO settings that can automatically
control the fan speed and/or mode of the air delivery
to the rear seating area.
9
(Off): An off setting, located on the overhead
climate control panel also allows the driver to turn off the
rear seat passenger seat controls from the front seat.
Rear Controls
The rear seat controls have the following settings:
O
(On/Off): Press this button to turn the rear seat
comfort controls on or off.
%
(Mode): Press this button to select the air delivery,
and setting, and AUTO mode.
b
(Temperature): Press this button up or down to
increase or decrease the temperature setting.
w9x
(Fan): Press this button up or down to adjust
the fan speed.
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