GMC Yukon 2021 Owner's Manual page 364

Warning (Continued)
overextended position or not lower fully.
Do not attempt to force the jack higher
once the height limit is reached.
5. Raise the vehicle by turning the wheel
wrench clockwise in the jack. Raise the
vehicle far enough off the ground so
there is enough room for the spare tire
to fit under the wheel well.
6. Remove all of the wheel nuts.
7. Remove the flat tire.
Warning
Rust or dirt on a wheel, or on the
parts to which it is fastened, can
cause wheel nuts to become loose
over time. The wheel could come off
and cause a crash. When changing a
wheel, remove any rust or dirt from
places where the wheel attaches to
the vehicle. In an emergency, a cloth
or paper towel can be used; however,
use a scraper or wire brush later to
remove all rust or dirt.
Vehicle Care
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.
Warning
Never use oil or grease on bolts or nuts
because the nuts might come loose. The
vehicle's wheel could fall off, causing a
crash.
10. Reinstall the wheel nuts. Tighten each
nut by hand. Then use the wheel wrench
to tighten the nuts until the wheel is
held against the hub.
11. Turn the wheel wrench counterclockwise
to lower the vehicle. Lower the jack
completely.
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