GM Service Manual Online
For 1990-2009 cars only

Use the thumbwheel located in the middle of the front outlets to change the direction of the airflow and to open and close the outlets.

Use the thumbwheel located between the rear passenger outlets to open and close the outlets. Adjust the direction of the airflow from side to side with the levers in the center of each rear outlet.

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.
    • If the airflow seems low when the fan is at the highest setting, the passenger compartment air filter may need to be replaced. See Passenger Compartment Air Filter .