Do not drive until the head restraints for all occupants are installed and adjusted properly.
See Head Restraints.
Seat Adjustment
Safety BeltChevrolet Cobalt Service & Repair Manual. Camshaft R&R
Removal
1.
Loosen vent hose clamp at air cleaner
resonator, air cleaner intake duct clamp at air cleaner outlet resonator.
2.
Loosen air cleaner outlet resonator
to throttle body clamp, located forward of accelerator cable bracket ...