1997 Buick Century Owner's Manual - Page 281

Air Cleaner To check or replace the air filter, loosen thewing nut on the air duct and lift on up the two clips locatedon the top of the filtercover. Disconnect the duct and reposition it while removing the sidecover. Operating the engine withthe air cleaner off cancause youor others to be burned. The air cleaner not only cleansthe 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 onthe engine with the air cleaner off. Pull out the filter. Be sure to install the air filter and install the cover tightly when you are finished. Refer to the Maintenance Schedule to determine to when replace the air filter. See "Scheduled Maintenance Services" the Index. in NOTICE: If the air cleaner is off, a backfire can cause a damaging engine fire. And, can easily get dirt into your engine, which will damage it. Always have the air cleaner in place when you're driving. 6-15