2009 Cadillac STS-V Owner's Manual - Page 350

How to Inspect the Engine Air Cleaner/Filter To inspect the air cleaner/filter remove the filter from the vehicle and lightly shake the filter to release loose dust and dirt. If the filter remains caked with dirt, a new filter is required. To inspect or replace the filter in the 3.6L V6 or 4.6L V8 engines, do the following: 1. Remove the two screws located on the top of the cover. 2. Disconnect the coolant recovery hose so that it is not going across the top of the engine air cleaner/filter. 3. Loosen the clamp and remove the duct from the passenger's side of the engine air cleaner/filter. 4. The two sides of the airbox are hinged at the bottom. Open the airbox by pushing the top of the airbox cover toward the engine. 5. Remove the air filter by lifting it straight up through the opening in the airbox. 6. Inspect or replace the engine air cleaner/filter. See Maintenance Replacement Parts on page 6-15 for the correct part number for the filter. 7. Reinstall the cover by reversing Steps 1 through 4. If your vehicle has the 4.4L V8 STS-V engine, there is a special procedure for checking and changing the air cleaner/filter. Because this procedure is difficult, you should have this done at the dealership service department. Contact your dealer for additional information or the procedure can be found in the service manual. To purchase a service manual, see Service Publications Ordering Information on page 7-15. 5-24