Removal Procedure

Important:  The thermostat and thermostat housing MUST be replaced as an assembly. The thermostat is not serviceable separately.

1. Open the radiator drain cock. Partially drain the radiator.
   NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
2. Close the drain cock.

   Tighten 

   Tighten the drain cock to 2 N.m (18 lb in).

3. Reposition the radiator outlet hose clamp at the water pump.
4. Remove the radiator outlet hose from the water pump inlet.
   Fig 1: Removing Radiator Outlet Hose From Water Pump Inlet

   Courtesy of GENERAL MOTORS CORP.
5. Remove the water pump inlet bolts.
6. Remove the water pump inlet.
   Fig 2: Removing Water Pump Inlet Bolts

   Courtesy of GENERAL MOTORS CORP.
7. The O-ring seal is integral to the thermostat housing.
8. Remove the thermostat.
   Fig 3: Removing Thermostat

   Courtesy of GENERAL MOTORS CORP.