2004 Cadillac DeVille Owner's Manual - Page 300

To inspect or replace the filter, do the following: 1. Loosen and remove both wing screws on the top of the engine air cleaner/filter cover. 2. Lift up the outboard side of the cover at an angle while pulling toward you. This is necessary due to the three tabs located on the rear of the cover. 3. Remove the engine air cleaner/filter element and any loose debris that may be found in the air cleaner base. 4. Replace the air filter element. Follow these steps to reinstall the cover to the engine air cleaner/filter housing: 1. Align the three tabs located on the back of the cover with the three slots on the back of the housing. 2. Push the cover slightly down and towards the engine to engage the tabs in the slots and align the two wing screws. 3. Engage and tighten the two wing screws on the top of the engine air cleaner/filter housing cover. 5-20