WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Blower Controls Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Compressor Control Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Air Delivery and Temperature Control Schematic