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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1451 (Engine Cooling System) >> Repair Instructions >> Thermostat Replacement (4.2L Engine) >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the necessary coolant from the radiator. Refer to Draining and Filling Cooling System (LL8)  or Draining and Filling Cooling System (LM4) .
  2. Remove the generator. Refer to Generator Replacement (4.2L Engine) or Generator Replacement (5.3L Engine) in Engine Electrical
    3. Fig 1: Locating Thermostat Housing
    GM753670Courtesy of GENERAL MOTORS CORP.
  3. Loosen the outlet hose clamp at the thermostat housing (1). Remove the outlet hose from the thermostat housing.
    4. Fig 2: Removing/Installing Thermostat Housing
    GM637656Courtesy of GENERAL MOTORS CORP.
  4. Remove the thermostat housing bolts.
  5. Remove the thermostat housing from the engine block.
  6. Clean all of the surfaces of the thermostat housing.
  7. Clean the sealing surface of the engine block.
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