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: View Of Forward Clutch Functional Air Check
Courtesy of GENERAL MOTORS CORP.
With air pressure set at 20 psi, check the forward clutch to verify proper operation of the seals and clutch assembly.