2007 Cadillac CTS Owner's Manual - Page 186

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. Passenger Compartment Air Filter The passenger compartment air filter traps most of the pollen from the air entering your vehicle. Like your vehicle's engine air cleaner/filter, it needs to be changed periodically. See Scheduled Maintenance on page 463. Using the climate control system without the passenger air filter installed may allow water or other debris to enter the system. This could cause a water leak or noises. Make sure to install a new air filter after removing the old one. The passenger compartment air filter is located underneath the hood below the windshield wiper arm on the passenger's side of the vehicle. See Engine Compartment Overview on page 342 for more information on location. Use the procedure listed below to replace the passenger compartment air filter: 1. Turn the ignition to ON with the engine off. 2. Turn on the windshield wipers and turn them off again when the wipers are straight on the windshield. This allows you access to the leaf screen. The passenger compartment air filter is located under the leaf screen. 186