WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Loosen the water crossover mounting bolts (1-6).
Fig 1: Loosening Water Crossover Mounting Bolts
Courtesy of GENERAL MOTORS CORP.
Remove the water crossover, gaskets and all mounting bolts.
Fig 2: Removing Water Crossover, Gasket & Mounting Bolts