GM Service Manual Online
For 1990-2009 cars only

Use the knob located in the center of each outlet to change the direction of the airflow.

Operation Tips

    â€¢ 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.
    â€¢ Use of non-GM approved hood deflectors may adversely affect the performance of the system.
    â€¢ Keep the path under the front seats clear of objects to help circulate the air inside of your vehicle more effectively.