Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

Partially drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
Remove the radiator inlet hose clamp from the water outlet housing.

Fig 1: Removing Thermostat
Courtesy of GENERAL MOTORS CORP.
Remove the radiator inlet hose.
Remove the water outlet housing mounting bolts.
Remove the water outlet housing from the engine.
Remove thermostat and O-ring seal.
Clean all of the parts.
Clean all of the sealing surfaces.

Fig 2: Removing Radiator Inlet Hose
Courtesy of GENERAL MOTORS CORP.