Installation Procedure

Important:  Position the air bleed valve facing upward.

1. Install the thermostat.
2. Install a new thermostat O-ring.
   Fig 1: Installing Thermostat

   Courtesy of GENERAL MOTORS CORP.
3. Install the thermostat housing to the cylinder block.
   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.
4. Use the 2 nuts (1) in order to secure the thermostat cap.
   Fig 2: Securing Thermostat Cap

   Courtesy of GENERAL MOTORS CORP.

   Tighten 

   Tighten the thermostat cap nuts to 9 N.m (80 in lbs).

5. Fill the radiator using approved coolant. Refer to Draining and Filling Cooling System .
6. Start the engine.
7. Run the engine until the coolant is at operating temperature. The coolant is at operating temperature when the following conditions exist:
   • The hoses feel warm.
   • The coolant is flowing through the radiator.
8. Inspect for leaks in the cooling system.
9. Turn off the engine.
10. Install the radiator cap.