Engine Coolant Thermostat Replacement 2.2L (L61)

Notice: The thermostat will not function correctly once it is contacted by oil. If oil is found in the cooling system, it must be flushed and the thermostat's cartridge replaced.




1. Drain the coolant. Refer to Cooling System Draining and Filling .



2. Remove the exhaust heat shield bolts.
3. Remove the exhaust heat shield.
4. Raise the vehicle.




Important: A drain plug has been provided at the bottom of the water pump assembly for additional coolant drainage from the engine block and water pump.

5. Drain the coolant from the water pump drain plug.



6. Remove the thermostat cover bolts from the thermostat housing.
7. Remove and discard the thermostat housing O-seal.




Important: Twist the water feed pipe while pulling to remove it from the water pump.

8. Remove the water pipe from the water pump assembly.
9. Remove and discard the seals from the water pipe.
10. Remove the inner thermostat sleeve.
11. Remove the thermostat assembly.

1. Install the thermostat cartridge into the thermostat housing while aligning the cartridge tangs up with the thermostat housing bolt holes. This will assure the inner sleeve can be completely installed.



2. Align and insert the inner sleeve notch into the thermostat housing. If the inner sleeve notch is not properly positioned, the sleeve will not completely seat into the housing.




Important: The water feed pipe seals can be slightly lubricated with silicone gel to aid during installation.

3. Install a new O-seal on the water pipe.
4. Position the water pipe into the water pump assembly.
5. Seat the water feed O-seal by pushing and twisting toward the water pump. Take care not to tear or damage the O-ring.



6. Install the thermostat housing cover to the water pipe. The water feed pipe has a locating tab to assure proper alignment.
7. Install a new thermostat housing cover seal into the recess groove.
8. Position the thermostat housing cover into position.

Notice: Refer to Fastener Notice in the Preface section.

9. Install the thermostat housing cover bolts.

Tighten
Tighten the thermostat housing cover-to-thermostat housing bolts to 10 N·m (89 lb in).




10. Lower the vehicle.
11. Install the exhaust manifold heat shield.
12. Install the exhaust manifold heat shield bolts.

Tighten
Tighten the exhaust manifold heat shield bolts to 23 N·m (17 lb ft).





Important: The vehicle must be level when filling the cooling system.

13. Verify the drain valve at the radiator and the water pump are closed.



14. Fill the engine coolant . Refer to Cooling System Draining and Filling .
15. Verify the repair and inspect for any leaks.

Engine Coolant Thermostat Replacement L66

1. Drain the coolant. Refer to Cooling System Draining and Filling .
2. Remove the battery. Refer to Battery Replacement .
3. Remove the thermostat housing.
4. Remove the thermostat.

1. Install the thermostat with housing.

1.1.	Install a new gasket.

1.2.	Position the thermostat with the housing.

1.3.	Apply thread sealant PST 565® to the bolt threads.

Notice: Refer to Fastener Notice in the Preface section.

1.4.	Install the housing bolts.

Tighten
Tighten the thermostat housing bolts 12 N·m (106 lb in).

2. Install the battery. Refer to Battery Replacement .
3. Fill the cooling system. Refer to Cooling System Draining and Filling .