2009 Cadillac CTS Owner's Manual - Page 175

Outlet Adjustment Use the air outlets located in the center and on the side of the instrument panel to direct the airflow. Use the thumbwheels near the air outlets to open or close off the airflow. Passenger Compartment Air Filter The passenger compartment air filter traps most of the dust and pollen from the air entering the vehicle. The filter will need to be changed periodically. See Scheduled Maintenance on page 6-4. Using the climate control system without the passenger air filter installed could let water or other debris enter the system. This could cause a water leak or noises. Make sure a new air filter is installed after removing the old one. Operation Tips • Clear away any ice, snow, or leaves from air inlets at the base of the windshield that could block the flow of air into the vehicle. • Keep the path under the front seats clear of objects to help circulate the air inside of the vehicle more effectively. • Use of non-GM approved hood deflectors can adversely affect the performance of the system. Check with your dealer/retailer before adding equipment to the outside of the vehicle. The passenger compartment air filter is located under the hood below the windshield wiper arm and the screen on the passenger side of the vehicle. See Engine Compartment Overview on page 5-14 for more information on location. 3-29