WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Removing Pressure Relief Valve From A/C Compressor
Courtesy of GENERAL MOTORS CORP.
Support the A/C compressor.
Remove the pressure relief valve from the A/C compressor.