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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling >> Repair Instructions >> Engine Coolant Thermostat Housing Replacement >> Removal Procedure

Removal Procedure

IMPORTANT: The thermostat is not serviceable separately. The thermostat housing (water pump inlet) and thermostat must be replaced as an assembly.
    Fig 1: MAF/IAT Sensor & Air Cleaner Assembly
    GM832908Courtesy of GENERAL MOTORS CORP.
  1. Drain the cooling system/engine block. Refer to Cooling System Draining and Filling (Static Fill)  or Cooling System Draining and Filling (Vac-N-Fill) .
  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. Fig 2: View Of Water Pump Inlet
    GM370076Courtesy of GENERAL MOTORS CORP.
  4. Remove the radiator outlet hose.
  5. Remove the thermostat housing bolts.
  6. Remove the thermostat housing from the water pump.
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