WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Install the thermostat.
Fig 1: Installing Thermostat
Courtesy of GENERAL MOTORS CORP.
Install the water outlet.
Install the water outlet bolts.
Tighten
Tighten the water outlet bolts to 25 N.m (18 lb ft).