WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Locating HVAC Components In Engine Compartment
Courtesy of GENERAL MOTORS CORP.
Fig 2: Locating HVAC Components At Left Side Of Interior
Courtesy of GENERAL MOTORS CORP.
Fig 3: Locating HVAC Components At Right Side Of Interior