GMC Yukon 2012 Owner's Manual page 274

8-12 Climate Controls
Automatic Operation, If
Equipped
AUTO: Press the air delivery mode
button until this setting is selected to
control the inside temperature, air
delivery, and fan speed. AUTO
appears in the display when
automatic operation is active.
+ or (Increase/Decrease
Temperature): Press the + or
buttons to increase or decrease the
cabin temperature. The rear control
temperature display will show the
temperature setting increasing or
decreasing.
The display only indicates climate
control functions when the system is
in rear independent mode.
Manual Operation
(Fan Control): Press these
buttons on the rear seat audio
control panel to increase or
decrease the airflow. Pressing the
fan up button when the system is off
will turn the system on. The air
delivery mode will remain under
automatic control.
+ or (Temperature Control):
Press these buttons to adjust the
temperature of the air flowing into
the passenger area. Press the +
button for warmer air and press the
button for cooler air.
(Air Delivery Mode Control):
Press the mode button to 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.