GMC 2008 Acadia - Manual (Page 392)

5. Do not raise the vehicle yet. Put the compact spare
tire near you.
{ CAUTION:
Getting under a vehicle when it is jacked up is
dangerous. If the vehicle slips off the jack, you
could be badly injured or killed. Never get under
a vehicle when it is supported only by a jack.
{ CAUTION:
Raising your vehicle with the jack improperly
positioned can damage the vehicle and even
make the vehicle fall. To help avoid personal
injury and vehicle damage, be sure to fit the
jack lift head into the proper location before
raising the vehicle.
6. Attach the lug wrench to the jack, and turn the
wrench clockwise to raise the jack head
3 inches (7.6 cm).
7. Place the jack under the vehicle as identified in
Step 3. Raise the vehicle by turning the lug
wrench clockwise in the jack. Raise the vehicle far
enough off the ground so that there is enough
room for the spare tire to fit under the wheel well.
8. Remove all the wheel nuts and the flat tire.
9. Remove the plastic spare tire heat shield by pulling
the rubber latch. Store the plastic spare tire heat
shield. See Storing a Flat or Spare Tire and
Tools on page 5-84 for more information.
5-78