2008 GMC Yukon Owner's Manual - Page 210

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. +/− (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 D or 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 C button. +/− (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. 3-36