2009 Chevrolet Suburban 2500 Owner's Manual - Page 210

Climate Controls Climate Control System The heating, cooling, and ventilation in the vehicle can be controlled with this system. Temperature Control: Move the thumbwheels up or down to increase or decrease the temperature on the driver's side or the passenger side of the vehicle for the dual zone system. 9 (Fan Control): 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. Air Delivery Mode Control: Turn clockwise or counterclockwise to change the airflow direction inside the vehicle. By positioning the knob between two modes, a combination of those modes is selected. Select from the following modes: H (Vent): A. B. C. D. Fan Control REAR Recirculation Air Delivery Mode Control E. Air Conditioning F. Driver and Passenger Temperature Controls G. Rear Window Defogger Air is directed to the instrument panel outlets. ) (Bi-Level): Air is divided between the instrument panel and floor outlets. Some 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. 6 (Floor): Air is directed to the floor outlets, with some of the air directed to the windshield, side window, and second row floor outlets. In this mode, the system automatically selects outside air. Recirculation cannot be selected when in Floor Mode. 3-22