Chevrolet 2008 Cobalt Owner's Manual page 46

The top tether anchors are located under the covers
on the rear seatback filler panel. Open the cover
to access the anchor. Be sure to use an anchor located
on the same side of the vehicle as the seating position
where the child restraint will be placed.
1-42
To assist you in locating
the top tether anchors, the
top tether anchor symbol
is located on the cover.
Do not secure a child restraint in a position without a
top tether anchor if a national or local law requires that
the top tether be attached, or if the instructions that
come with the child restraint say that the top tether must
be attached.
Accident statistics show that children are safer if they
are restrained in the rear rather than the front seat.
See Where to Put the Restraint on page 1-38 for
additional information.