Thermostat: Service and Repair

Thermostat Replacement (LS2)

Removal Procedure

Important: The water pump inlet (thermostat housing) and thermostat MUST be replaced as an assembly. The thermostat is not serviceable separately.




1. Drain the cooling system. Refer to Draining and Filling Cooling System (GE 47716) Draining and Filling Cooling System (LP1, LY7 Static Fill) Draining and Filling Cooling System (LS2 Static Fill).
2. Remove the cooling fan assembly.
3. Reposition the outlet hose clamp at the water pump inlet.
4. Remove the outlet hose from the water pump inlet.
5. Remove the thermostat housing bolts.
6. Remove the thermostat housing.




7. The thermostat and O-ring seal are integral to the thermostat housing.

Installation Procedure




1. Install a new thermostat housing.
2. Ensure that the new thermostat housing has an O-ring seal and is in the groove correctly.




3. Install the thermostat housing (with thermostat).

Notice: Refer to Fastener Notice.

4. Install the thermostat housing bolts.

Tighten the thermostat housing bolts to 15 N.m (11 lb ft).

5. Install the outlet hose to the thermostat housing.
6. Position the outlet hose clamp at the thermostat housing.
7. Install the cooling fan assembly.
8. Fill the cooling system. Refer to Draining and Filling Cooling System (GE 47716) Draining and Filling Cooling System (LP1, LY7 Static Fill) Draining and Filling Cooling System (LS2 Static Fill).