GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
HUMMER
🢒
2009
🢒
H3
🢒
Engine
🢒
Engine Cooling
🢒 Engine Coolant Thermostat Replacement
Engine Coolant Thermostat Replacement LH8
Removal Procedure
Remove the thermostat housing. Refer to
Engine Coolant Thermostat Housing Replacement
.
Remove the thermostat.
Installation Procedure
Install the thermostat.
Install the thermostat housing. Refer to
Engine Coolant Thermostat Housing Replacement
.
Engine Coolant Thermostat Replacement LLR
Special Tools
J-38185
Hose Clamp Pliers
Removal Procedure
Drain the cooling system. Refer to
Cooling System Draining and Filling
.
Raise and support the vehicle only high enough to access the thermostat housing (4) through the wheelhouse. Refer to
Lifting and Jacking the Vehicle
.
Remove the left front wheelhouse liner. Refer to
Front Wheelhouse Liner Replacement
.
Position the
J-38185
pliers to the clamp (3) in order to remove the radiator inlet hose (2) from the thermostat housing (4).
Remove the thermostat housing bolts.
Remove the thermostat housing from the engine block.
Clean and inspect the thermostat housing.
Clean and inspect the sealing surface of the engine block.
Installation Procedure
Position the thermostat housing to the engine block.
Caution:
Refer to
Fastener Caution
in the Preface section.
Install the thermostat housing bolts and tighten to
10 N·m (89 lb in)
.
Position the
J-38185
pliers to the clamp (3) in order to connect the radiator inlet hose (2) to the thermostat housing (4).
Install the left front wheelhouse liner. Refer to
Front Wheelhouse Liner Replacement
.
Lower the vehicle.
Fill the cooling system. Refer to
Cooling System Draining and Filling
.
Inspect all sealing surfaces for leaks after starting the engine.