WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Manual Valve Link
Courtesy of GENERAL MOTORS CORP.
Disconnect the manual valve clip (801) from the manual valve.
NOTE:
Do not attempt to remove the manual valve, damage may occur.
Disconnect the manual valve link (802) from the manual valve.