2006 GMC Envoy Owner's Manual - Page 437

7. Remove all the wheel nuts and take off the flat tire. 8. Remove any rust or dirt from the wheel bolts, mounting surfaces and spare wheel. 9. Place the spare tire on the wheel-mounting surface. {CAUTION: Rust or dirt on the wheel, or on the parts to which it is fastened, can make the wheel nuts become loose after a time. The wheel could come off and cause an accident. When you change a wheel, remove any rust or dirt from the places where the wheel attaches to the vehicle. In an emergency, you can use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush later, if needed, to get all the rust or dirt off. 5-81