Chevrolet 2008 Colorado Owner's Manual page 352

Regular/Extended Cab
5-86
For regular and extended
cab vehicles, the jack and
wheel blocks are located
under the cover at the
center of the vehicle
behind the front seats.
To access the tools:
Extended/Regular Cab
2. Turn the wing nut on the cover counterclockwise to
remove it.
For crew cab models, reach under the rear seat to
access the jack and wheel blocks. To reinstall
the jack and wheel block assembly in the mounting
bracket, insert the tabs into the jack base by
pushing the blocks up into the assembly. The outer
hole in the jack base aligns with the tab on the
bracket. When reinstalling, make sure the jack is
secure, but do not overtighten the jack in the
bracket.
1. Move the seats forward
to access the cover.