Oldsmobile 2003 Bravada Owner's Manual page 139

Ventilation System
For mild outside temperatures when little heating or
cooling is needed, use the panel outlet setting to direct
outside air through your vehicle. Air will flow through
the instrument panel outlets.
Your vehicle's flow-through ventilation system supplies
outside air into the vehicle when it's moving. When the
vehicle is not moving, you can get outside air to flow
through by selecting any air delivery mode and any fan
speed.
Move the control in the center of each outlet side-to-side
to direct the air from the outlet. Use the thumbwheel
under the outlet to close the louvers. For the most
efficient airflow and temperature control, keep the
louvers in the fully opened position.
The rear seat outlets can be used to adjust the airflow
toward either seating area, the floor or upward. Move the
control in the center of each outlet side-to-side to
direct airflow.
Your vehicle has air outlets that allow you to adjust the
direction and amount of airflow inside the vehicle.
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