GMC 2008 Yukon Denali Owner's Manual page 192

To turn the system on from the rear, press any rear
climate control button, except the
system off, press and hold the
Rear Climate Control with Rear Seat Audio Controls
Automatic Operation, If Equipped.
AUTO: Press the mode button until this setting is
selected to control the inside temperature, the air
delivery, and the fan speed. AUTO will illuminate in the
display when automatic operation is active.
3-30
C
button. To turn the
C
button.
+/− (Increase/Decrease Temperature): Press the + or
− buttons to increase or decrease the cabin temperature.
The rear control temperature display will show the
temperature setting decreasing or increasing.
The display only indicates climate control functions
when the system is in rear independent mode.
Manual Operation
D C
(Fan): Use the fan buttons on the rear seat audio
control panel to manually adjust the fan speed. To
increase or decrease the airflow, press the
C
button. Pressing the fan up button when the system
is off will turn the system on. The air delivery mode
will remain under automatic control. To turn the
rear system off, keep pressing the
+/− (Increase/Decrease Temperature): These buttons
select the temperature of the air flowing into the
passenger area. Press the + button for warmer air and
press the − button for cooler air.
N
(Mode): Press the mode button to manually change
the direction of the airflow in the vehicle. Repeatedly
press the button until the desired mode appears on the
display. Multiple presses will cycle through the
delivery selections.
D
or
C
button.