1998 Buick Century Owner's Manual - Page 275

Air Cleaner To check or replace the air filter, loosen the wing nut on the air ductand lift up on the two clips located the on top of the filtercover. Disconnect the duct and reposition it while removing the side cover. 1 CA" ION: Operating theengine with the air cleaner off can cause you or others to be burned. The air cleaner not only cleans the air, it stops flame if the engine backfires. If it isn't there, and the engine backfires, you could beburned. Don't drive with it off, and be careful working on the engine with the air cleaner off. Pull out thefilter. Be sure to install the air filterand install the cover tightly when you are finished. Refer to the Maintenance Schedule to determine when to replace the airfilter. See "Scheduled Maintenance Services'' in the Index. NOTICE: If the air cleaner is off, a backfire Cause a damaging engine fire. And, dirt can easily get into your engine, whichwill damage it. Always have the air cleaner in place when you're driving. 6-15