For 1990-2009 cars

Use the thumbwheels located next to and below the air outlets to change the direction of the airflow and to open and close the outlets.

#### 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 the 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 the vehicle more effectively.