2005 Buick Park Avenue Owner's Manual - Page 252

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 engine air cleaner/filter, do the following: 2. Remove the air intake hose that snaps over the throttle body by pulling the hose upward and away from the throttle body. As you are detaching the hose, remove the housing cover by pulling upward and rearward. 1. Remove the wing nuts on the engine air cleaner/filter housing cover. 5-20