Do not drive until the head restraints for all occupants are installed and adjusted properly.
See Head Restraints.
Seat Adjustment
Safety BeltChevrolet Cobalt Owners Manual. Reclining Seatbacks
WARNING:
You can lose control of the vehicle if you try to
adjust a manual driver's seat while the vehicle is
moving. The sudden movement could startle and
confuse you, or make you push a pedal when you
do not want to. Adjust the driver's seat only when
the vehicle is not moving.
WARNING:
If ...