GMC Chevrolet Tahoe 2003 Manual page 188

Outlet Adjustment
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.
Rear seat outlets can be used to adjust airflow toward
either seating area, the floor or upward. Move the center
louvers up or down to direct the airflow.
3-24
Use the air outlets located
in the center and on the
side of your instrument
panel to direct the airflow.
Operation Tips
•
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.