WARNING: This page is about a different car, the 2003 Chevrolet Monte Carlo and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: A/C Compressor Control Relay
Courtesy of GENERAL MOTORS CORP.
Remove the underhood lower relay cover.
Fig 2: Underhood Lower Relay Panel Cover
Courtesy of GENERAL MOTORS CORP.
Remove the A/C compressor control relay from the electrical center.