Engine Coolant Thermostat Replacement LY7

1. Partially drain the cooling system. Refer to Cooling System Draining and Filling.

Note: Do NOT separate the upper and lower intake manifolds.

2. Remove the upper intake manifold with the lower intake manifold. Refer to Lower Intake Manifold Replacement.
3. Disconnect the surge tank hose from the thermostat.



4. Remove the coolant pipe/thermostat housing bolt (2).
5. Remove the coolant pipe upper bolt (7).
6. Remove the coolant inlet pipe (4) from the thermostat.



7. Remove the thermostat bolts.
8. Remove the thermostat and discard the thermostat seal.

1. Install the thermostat with a NEW thermostat seal.

Caution: Refer to Fastener Caution in the Preface section.

2. Install the thermostat bolts and tighten to 10 N·m (89 lb in).



3. Install the coolant pipe (4), NEW seal, and fasteners (2 and 7). Refer to Engine Coolant Inlet Pipe Replacement.
4. Install the surge tank hose to the thermostat.
5. Install the upper intake manifold with the lower intake manifold. Refer to Lower Intake Manifold Replacement.
6. Fill the cooling system. Refer to Cooling System Draining and Filling.

Engine Coolant Thermostat Replacement V6

1. Partially drain the cooling system. Refer to Cooling System Draining and Filling.
2. Remove the upper intake manifold. Refer to Intake Manifold Replacement.
3. Disconnect the surge tank outlet pipe from the thermostat. Refer to Radiator Surge Tank Outlet Hose/Pipe Replacement.



4. Remove the coolant pipe/thermostat housing bolt (2).
5. Remove the coolant pipe upper bolt (7).
6. Remove the coolant inlet pipe (4) from the thermostat.



7. Remove the thermostat bolts (1).
8. Remove the thermostat (2) and discard the thermostat seal (3).

1. Install the thermostat (2) with a NEW thermostat seal (3).

Caution: Refer to Fastener Caution in the Preface section.

2. Install the thermostat bolts (1) and tighten to 10 N·m (89 lb in).



3. Install the coolant pipe (4), NEW seal, and fasteners (2 and 7). Refer to Engine Coolant Inlet Pipe Replacement.
4. Connect the surge tank outlet pipe to the thermostat. Refer to Radiator Surge Tank Outlet Hose/Pipe Replacement.
5. Install the upper intake manifold. Refer to Intake Manifold Replacement.
6. Fill the cooling system. Refer to Cooling System Draining and Filling.

Engine Coolant Thermostat Replacement LC3

1. Drain the cooling system. Refer to Cooling System Draining and Filling.
2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
3. Remove the radiator hose from the thermostat housing. Refer to Radiator Outlet Hose Replacement.
4. Remove the heater hose from the thermostat housing. Refer to Heater Outlet Hose Replacement.
5. Remove the thermostat housing bolts (4).
6. Remove the thermostat housing (3) with thermostat (1), from the water housing.
7. Remove and discard the seal ring (2).
8. Remove the thermostat from the thermostat housing.

1. Clean the thermostat housing and water housing sealing surfaces.
2. Install the thermostat (1) to the thermostat housing (3).
3. Install the NEW seal (2) to the thermostat housing.
4. Install the thermostat housing (3) with the thermostat (1) and the seal (2) to the water housing.

Caution: Refer to Fastener Caution in the Preface section.

5. Install the thermostat housing bolts (4) and tighten to 10 N·m (89 lb in).
6. Install the heater hose to the thermostat housing. Refer to Heater Outlet Hose Replacement.
7. Install the radiator hose to the thermostat housing. Refer to Radiator Outlet Hose Replacement.
8. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
9. Fill the cooling system. Refer to Cooling System Draining and Filling.

Engine Coolant Thermostat Replacement LH2

1. Drain the cooling system. Refer to Cooling System Draining and Filling.
2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
3. Remove the radiator hose from the thermostat housing. Refer to Radiator Outlet Hose Replacement.
4. Remove the heater hose from the thermostat housing. Refer to Heater Outlet Hose Replacement.
5. Remove the thermostat housing bolts.
6. Remove the thermostat housing (1) with thermostat (3), from the water housing.
7. Remove and discard the seal ring (2).
8. Remove the thermostat from the thermostat housing.

1. Clean the thermostat housing and water housing sealing surfaces.
2. Install the new thermostat to the thermostat housing.
3. Install the NEW seal (2) to the thermostat housing.
4. Install the thermostat housing (1) with the thermostat (3) and the seal (2) to the water housing.

Caution: Refer to Fastener Caution in the Preface section.

5. Install the thermostat housing bolts and tighten to 10 N·m (89 lb in).
6. Install the heater hose to the thermostat housing. Refer to Heater Outlet Hose Replacement.
7. Install the radiator hose to the thermostat housing. Refer to Radiator Outlet Hose Replacement.
8. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement.
9. Fill the cooling system. Refer to Cooling System Draining and Filling.