Chevrolet 2008 Colorado Owner's Manual page 356

3. Use the wheel wrench to loosen all the wheel nuts
by turning it counterclockwise. Do not remove the
wheel nuts yet.
5-90
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.