2003 Chevrolet Tahoe Owner's Manual - Page 180

Outlet Adjustment ...,, Operation Tips Use the air outlets located in the center and on the side of your instrument panel to direct the airflow. Keep the hood and front air inlets free of ice, snow, or any other obstruction (such as leaves). The heater and defroster will work far better, reducing the chance of fogging the inside of your windows. Keep the air path under the front seats clear of objects. This helps air to circulate throughout your vehicle. Adding outside equipment to the front of your vehicle, such as hood-air deflectors, etc., may affect the performance of the heating and air conditioning system. Check with your dealer before adding equipment to the outside of your vehicle. Your vehicle has air outlets that allow you to adjust the direction and amount of airflow inside the vehicle. Move the louvers up or down. Use the thumbwheel next to or underneath the outlet to close the louvers. For the most efficient airflow and temperature control, keep the outlet in the fully opened position. If your vehicle is equipped with rear seat outlets they can be used to adjust airflow toward either seating area, the floor, or upward. Move the center louver up or down to direct the airflow. 3-29