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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1498 (Engine Cooling System) >> Repair Instructions >> Thermostat Replacement (4.2L Engine) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 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 (BODY VIN CODE 6)   or DRAINING AND FILLING COOLING SYSTEM (BODY VIN CODE 3)   .
  2. Remove the generator. Refer to CHARGING SYSTEM  or CHARGING SYSTEM  in Engine Electrical
  3. Loosen the outlet hose clamp at the water inlet (1) of the thermostat. Remove the outlet hose from the water inlet.
    Fig 1: Thermostat Location - 4.2L Engine
    G02129801Courtesy of GENERAL MOTORS CORP.
  4. Remove the thermostat housing at the water inlet 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.
    Fig 2: Removing Thermostat Housing From Engine Block (4.2L Engine)
    G02129802Courtesy of GENERAL MOTORS CORP.
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