GM Service Manual Online
For 1990-2009 cars only

Use the thumbwheels located between the center outlets to open and close the outlets. Move the lever in the center of each air outlet to adjust the direction of the 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 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.
    • If the vehicle has a passenger compartment air filter and the airflow seems low when the fan is at the highest setting it may need to be replaced. For more information, see Passenger Compartment Air Filter .

Rotate the instrument panel outlets and move the louvers on the outlets to change the direction and amount of airflow in your vehicle.

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.
    • When an objectionable odor outside the vehicle is encountered, use the MAX mode, with the temperature knob at a comfortable setting to prevent the odor from entering the vehicle through the ventilation system. This can be helpful when driving through a long tunnel with poor ventilation. However, extended usage of this mode in cold or cool weather can cause window fogging.