GMC 2003 Savana Van Owner's Manual page 144

Outlet Adjustment
Use the outlets located
near the center and on the
sides of the instrument
panel to change the
direction of airflow.
Operation Tips
Clear away any ice, snow or leaves from the air
inlets at the base of the windshield that may
block the flow of air into your vehicle.
Use of non-GM approved hood deflectors may
adversely affect the performance of the system.
Keep the path under the front seats clear of objects
to help circulate the air inside of your vehicle more
effectively.
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