2008 GMC Sierra 1500 Pickup Owner's Manual - Page 158

Climate Controls Climate Control System (With Air Conditioning) With this system you can control the heating, cooling, and ventilation for your vehicle. Use the right knob to select from the following modes: The right knob can be positioned between two modes to select a combination of those two modes. H (Vent): This mode directs air to the instrument panel outlets. This mode directs half of the air to the instrument panel outlets and half to the floor outlets. ) (Bi-Level): 6 (Floor): This mode directs most of the air to the floor outlets with some air directed to the windshield and side window outlets. In this mode, the system will automatically select outside air. Recirculation cannot be selected in floor mode. The right knob may also be used to select the defrost and defog mode. For more information, see "Defogging and Defrosting" later in this section. Operation 9 (Fan): Turn the left knob clockwise or counterclockwise to increase or decrease the fan speed. Turn the knob all the way counterclockwise to turn the front system off. Temperature Control: Turn the center knob clockwise or counterclockwise to increase or decrease the temperature inside the vehicle. 3-22 : (Outside Air): Press this button to turn the outside air mode on. When the button is pressed, an indicator light will come on. When this mode is on, outside air will circulate throughout the vehicle. The outside air mode can be used with all modes, but it cannot be used with the recirculation mode. ?(Recirculation): Press this button to turn the recirculation mode on. When the button is pressed, an indicator light will come on.