GMC Acadia Owner's Manual page 331

2. If the vehicle has a wheel cover,
loosen the plastic nut caps with
the wheel wrench. They will not
come off. Then, using the flat
end of the wheel wrench, pry
along the edge of the cover until
it comes off. Be careful; the
edges may be sharp. Do not try
to remove the cover with your
bare hands.
Store the wheel cover securely
in the rear of the vehicle until
you have the flat tire repaired or
replaced.
If the vehicle has aluminum
wheels, remove the wheel nut
caps using the wheel wrench.
3. Loosen the wheel nuts
not remove them
wrench. For wheels with a wheel
lock key, use the wheel lock key
between the lock nut and
wrench. The key is supplied in
the front passenger door pocket.
If this vehicle has wheel locks and
an impact wrench is used to
remove the wheel nuts, the lock
nut or wheel lock key could be
damaged. Do not use an impact
wrench to remove the wheel nuts
if this vehicle has wheel locks.
but do
using the
Vehicle Care 10-61
Caution