H3 2006

Removal & Installation

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3.5L & 3.7L Engines



Specific to:

Hummer H3 2006-2010

  1. Drain the cooling system.
  2.  
  3. Raise and support the vehicle only high enough to access the thermostat housing through the wheelhouse.
  4.  
  5. Remove the left wheelhouse liner.

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    Fig. Remove the left front wheelhouse panel

  6.  
  7. Using the hose clamp pliers (J 38185), reposition the clamp in order to remove the radiator inlet hose from the thermostat housing.

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    Fig. Using the hose clamp pliers (J 38185), reposition the clamp in order to remove the radiator inlet hose from the thermostat housing

  8.  
  9. Remove the thermostat housing bolts.

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    Fig. Remove the thermostat housing bolts

  10.  
  11. Remove the thermostat housing from the engine block.
  12.  
  13. Clean and inspect the thermostat housing.
  14.  
  15. Clean and inspect the sealing surface of the engine block.
  16.  

To install:

  1. Position the thermostat housing to the engine block.
  2.  
  3. Install the thermostat housing bolts. Tighten the bolts to 89 inch lbs. (10 Nm).
  4.  
  5. Position the J 38185 to the clamp in order to connect the radiator inlet hose to the thermostat housing.
  6.  
  7. Install the left wheelhouse liner.
  8.  
  9. Lower the vehicle.
  10.  
  11. Fill the cooling system.
  12.  
  13. Inspect all sealing surfaces for leaks after starting the engine.
  14.  

5.3L Engine



Specific to:

Hummer H3 2006-2010

  1. Drain the cooling system.
  2.  
  3. Remove the air cleaner outlet duct.
  4.  
  5. Reposition the radiator outlet hose clamp at the water pump inlet.

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    Fig. Reposition the radiator outlet hose clamp (1) at the water pump inlet and remove the radiator outlet hose (2)

  6.  
  7. Remove the radiator outlet hose from the water pump inlet.
  8.  
  9. Remove the water pump inlet bolts.

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    Fig. Remove the water pump inlet bolts (1)

  10.  
  11. Remove the water pump inlet from the water pump.
  12.  
  13. Remove and discard the water pump inlet seal.
  14.  
  15. Remove the thermostat housing.
  16.  
  17. Remove the thermostat.

    Click image to see an enlarged view

    Fig. Remove the thermostat

  18.  

To install:

  1. Install the thermostat.
  2.  
  3. Install the thermostat housing.
  4.  
  5. Install a NEW water pump inlet seal to the water pump inlet.
  6.  
  7. Position the water pump inlet to the water pump.
  8.  
  9. Install the water pump inlet bolts. Tighten the bolts to 11 ft. lbs. (15 Nm).
  10.  
  11. Install the radiator outlet hose to the water pump inlet.
  12.  
  13. Position the radiator outlet hose clamp at the water pump inlet.
  14.  
  15. Install the air cleaner outlet duct.
  16.  
  17. Fill the cooling system.
  18.  

 
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