2008 GMC Yukon Owner's Manual - Page 203

Manual Operation You may manually adjust the air delivery mode or fan speed. The air delivery mode setting will be displayed and the AUTO light will turn off. The fan will remain under automatic control. y9 z (Fan): The buttons with the fan symbols allow you to manually adjust the fan speed. Press the up arrow to increase fan speed and the down arrow to decrease fan speed. Pressing one of these buttons when the system is off will turn the system on. Pressing one of these buttons when in automatic control will place the fan under manual control. The fan setting will remain displayed and the AUTO light will turn off. The air delivery mode will remain under automatic control. H (Vent): This setting will deliver air to the instrument panel outlets. ) (Bi-Level): This mode directs half of the air to the instrument panel outlets and half to the floor outlets. The flow can be divided between vent and floor outlets depending upon where the knob is placed between the settings. A little air is directed towards the windshield and side window outlets. Cooler air is directed to the upper outlets and warmer air to the floor outlets. This mode directs most of the air to the floor outlets, with some of the air directed to the windshield, side window outlets, and second row floor outlets. In this mode, the system automatically selects outside air. 6 (Floor): Press the mode up and down buttons to manually change the direction of the airflow in the vehicle. Repeatedly press the button until the desired mode appears on the display. Pressing one of these buttons when the system is off will change air delivery mode without turning the system on. Pressing one of these buttons when in automatic control will place the mode under manual control. yN z (Mode): - (Defog): See "Defogging and Defrosting" later in this section. 3-29