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Home >> Hummer >> 2004 >> H2 V8-6.0L >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Cooling System >> Thermostat >> Service and Repair
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Thermostat: Service and Repair

THERMOSTAT HOUSING REPLACEMENT

REMOVAL PROCEDURE

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




1. Drain the cooling system/engine block.
2. Loosen the air cleaner outlet duct clamps at the throttle body and at the Mass Airflow (MAF) sensor.
3. Remove the air cleaner outlet duct.




4. Remove the radiator outlet hose.
5. Remove the water pump inlet bolts.
6. Remove the water pump inlet from the water pump.

INSTALLATION PROCEDURE




1. Install the water pump inlet to the water pump.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the water pump inlet bolts.

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

3. Install the radiator outlet hose.




4. Install the air cleaner outlet duct.
5. Install the air cleaner outlet duct clamps at the throttle body and at the Mass Airflow (MAF) sensor.

Tighten
Tighten the air cleaner outlet duct clamp screws to 7 N.m (62 lb in).

6. Fill the cooling system.
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