Engine Coolant Thermostat Replacement 3.1L

Notice: When adding coolant, use DEX-COOL® coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50 000 km (30,000 mi) or 24 months.

1. Remove the air cleaner and duct assembly.
2. Partially drain the coolant. Refer to Cooling System Draining and Filling .



3. Disconnect the radiator inlet hose from the coolant outlet.



4. Remove the coolant outlet attaching bolts.



5. Remove the coolant outlet.
6. Remove the thermostat.
7. Clean the gasket mating surfaces.

1. Install the thermostat.
2. Install the coolant outlet to the intake manifold.



3. Install the coolant outlet attaching bolts. Apply RTV sealer GM P/N 1052366, or equivalent, to the bolts.

Tighten
Tighten the bolts to 25 N·m (18 lb ft).

Notice: 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. Install the radiator inlet hose to the coolant outlet.
5. Install the air cleaner and duct assembly.

Important: Use the air bleed vents in order to properly fill a completely drained system.

6. Refill the coolant. Refer to Cooling System Draining and Filling .
7. Start the engine. After the engine reaches normal operating temperature, check for leaks.

Engine Coolant Thermostat Replacement 3.4L

Notice: When adding coolant, use DEX-COOL® coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50 000 km (30,000 mi) or 24 months.

1. Remove the air cleaner and duct assembly.
2. Drain the coolant to a level below the thermostat. Refer to Cooling System Draining and Filling .
3. Remove the engine mount strut bolt at the engine. Refer to Engine Mount Strut Replacement in Engine Mechanical.



4. Disconnect the radiator inlet hose from the coolant outlet.
5. Remove the throttle cable cover.



6. Remove the coolant outlet retaining bolts.
7. Remove the coolant outlet.
8. Remove the thermostat and the gasket.
9. Clean the gasket mating surfaces.

1. Install the thermostat and the gasket.
2. Install the coolant outlet to the intake manifold.
3. Install the bolts to the coolant outlet. Apply RTV sealer GM P/N 1052366, or equivalent, to the bolts.

Tighten
Tighten the bolts to 25 N·m (18 lb ft).

Notice: 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. Install the throttle cable cover.



5. Install the radiator inlet hose to the coolant outlet.
6. Install the engine mount strut to engine bolt. Refer to Engine Mount Strut Replacement in Engine Mechanical.
7. Install the air cleaner and duct assembly.

Important: Use the air bleed vents in order to properly fill a completely drained system.

8. Refill the coolant. Refer to Cooling System Draining and Filling .
9. Start the engine. After the engine reaches normal operating temperature, check for coolant leaks.

Engine Coolant Thermostat Replacement 3.8L

Notice: When adding coolant, use DEX-COOL® coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50 000 km (30,000 mi) or 24 months.

1. Remove the air cleaner and duct assembly.
2. Partially drain the engine coolant. Refer to Cooling System Draining and Filling .
3. Remove the engine front cover. Refer to Engine Front Cover Replacement in Engine Mechanical.
4. Remove the engine mount strut to engine bolt. Refer to Engine Mount Strut Replacement in Engine Mechanical.



5. Disconnect the radiator inlet hose (2) from the coolant outlet (1).
6. Remove the bolts from the coolant outlet.



7. Remove the coolant outlet (2).
8. Remove the gasket (3) and the thermostat (4).
9. Clean the gasket mating surfaces.

1. Install the thermostat (4) and a new gasket (3).
2. Install the coolant outlet (2) to the intake manifold.
3. Install the bolts (1) to the coolant outlet. Apply RTV sealer GM P/N 1052366, or equivalent, to the bolts.

Tighten
Tighten the bolts to 27 N·m (20 lb ft).

Notice: 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. Install the radiator inlet hose (2) to the thermostat housing. Connect the radiator inlet hose to the coolant outlet (1).
5. Install the engine front cover. Refer to Engine Front Cover Replacement in Engine Mechanical.
6. Install the engine mount strut to engine bolt. Refer to Engine Mount Strut Replacement in Engine Mechanical.
7. Install the air cleaner and duct assembly.
8. Refill the engine coolant. Refer to Cooling System Draining and Filling .
9. Start the engine. After the engine reaches normal operating temperature, check for coolant leaks.