Thermostat: Service and Repair

Engine Coolant Thermostat Replacement (LF1/LLT)

Removal Procedure

1. Partially drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill LSA) Service and RepairCooling System Draining and Filling (GE 47716 LSA) Service and RepairCooling System Draining and Filling (Static Fill LF1, LLT,LFW or LFX) Service and RepairCooling System Draining and Filling (GE 47716 LF1, LLT,LFW or LFX) Service and Repair.
2. Remove the upper intake manifold. Refer to Intake Manifold Replacement Intake Manifold Replacement.
3. Disconnect the surge tank outlet pipe from the thermostat.




4. Remove the coolant pipe/thermostat housing bolt (2).
5. Remove the coolant pipe upper bolt (3).
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).

Installation Procedure




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

Caution: Refer to Fastener Caution Fastener Caution.

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




3. Install the coolant pipe (4), NEW seal, and fasteners (2 and 3).
4. Connect the surge tank outlet pipe to the thermostat. 5. Install the upper intake manifold.
6. Fill the cooling system.