Tools Required

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

J 41790 A/C Compressor Holding Fixture

Coat the control valve O-ring with clean 525 viscosity refrigeration oil.
Push the A/C compressor control valve into the A/C compressor with thumb pressure.
Using internal snap ring pliers, install the A/C compressor control valve retaining ring.
Make sure the retaining ring is properly seated in the ring groove.
Remove the A/C compressor from the J 41790 .
Install the A/C compressor into the vehicle.

Fig 1: Installing A/C Compressor Control Valve Retaining Ring

Courtesy of GENERAL MOTORS CORP.