2009 Buick Lucerne Owner's Manual - Page 172

Outlet Adjustment Use the levers, located in the middle of the front outlets, to change the direction of the airflow. Use the thumbwheel located between the outlets to turn them on and off. If the vehicle has rear seat outlets, adjust the direction of the airflow using the lever in the center of each outlet. Passenger Compartment Air Filter Outside air is routed through a passenger compartment air filter before entering the vehicle. This filter removes certain particles from the air, including pollen and dust particles. The filter should be replaced as part of routine scheduled maintenance. See Scheduled Maintenance on page 6-4 for when to replace the filter. The access panel for the passenger compartment air filter is located under the hood near the windshield, on the passenger's side of the vehicle. Operation Tips • Clear away any ice, snow, or leaves from the air inlets at the base of the windshield that could block the flow of air into the vehicle. • Use of non-GM approved hood deflectors can adversely affect the performance of the system. • Keep the path under the front seats clear of objects to help circulate the air inside the vehicle better. 3-32