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.
Fig 1: Noise Diagnosis - Air Conditioning (A/C) System Chart (Step 1-14)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Noise Diagnosis - Air Conditioning (A/C) System Chart (Step 15-26)