1999 Cadillac DeVille Owner's Manual - Page 286

yellowblue Engine Air Cleaner/Filter 1. Disconnect the Intake Air Temperature (IAT) sensor from the base of the air cleaner. The engine air cleaner/filter is located next to the windshield washer fluid reservoir on the driver's side of the engine. Be sure the engine has cooled before following these steps to replace the air cleaner filter: 2. With a screwdriver, loosen the air duct clamp, which is located at the mass airflow sensor end of the air duct. 3. Disconnect the air duct from the mass airflow sensor. 6-16