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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1059 (Engine Mechanical - 6.6L (Lb7) (Repair Instructions 4 Of 4)) >> Repair Instructions (Off-Vehicle - Part 4) >> Thermostat Housing Installation

Thermostat Housing Installation

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the oil level sensor harness.
    2. NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Install the ground bolt to the left side of the block.

    Tighten:  Tighten the ground bolt to 34 N.m (25 lb ft).

    3. Fig 1: View Of Ground Bolt (Left Side Of Engine Block)
    GM881728Courtesy of GENERAL MOTORS CORP.
  3. Connect the oil pressure sensor connector.
  4. Install the turbocharger coolant outlet pipe.
  5. Install the turbocharger coolant outlet pipe bracket bolts.

    Tighten:  Tighten the turbocharger coolant outlet pipe bracket bolts to 21 N.m (15 lb ft).

    6. Fig 2: View Of Turbocharger Coolant Outlet Pipe & Bracket
    GM755218Courtesy of GENERAL MOTORS CORP.
  6. Install a new O-ring to the bypass pipe. Lubricate the O-ring with engine coolant.
  7. Install the bypass pipe to the thermostat housing.
    8. Fig 3: View Of Bypass Pipe To Thermostat Housing & O-Ring
    GM660428Courtesy of GENERAL MOTORS CORP.
  8. Install new thermostat housing gaskets.
  9. Install the thermostat housing with the bypass pipe.
    10. Fig 4: View Of Thermostat Housing & Bypass Pipe
    GM660426Courtesy of GENERAL MOTORS CORP.
  10. Install the bypass pipe to water pump bolts.

    Tighten:  Tighten the bypass pipe to water pump bolts to 21 N.m (15 lb ft).

  11. Install the thermostat housing bolts and nuts.

    Tighten:  Tighten the thermostat housing bolts and nuts in sequence to 25 N.m (18 lb ft).

    12. Fig 5: Thermostat Housing Bolt Tightening Sequence
    GM793975Courtesy of GENERAL MOTORS CORP.
  12. Install the right fuel rail high pressure pipe to the thermostat housing bracket bolt.

    Tighten:  Tighten the high pressure pipe bracket bolt to 21 N.m (15 lb ft).

  13. Install a new O-ring on the heater pipe. Lubricate the O-ring with engine coolant.
  14. Install the heater pipe.
  15. Install the heater pipe bracket bolt.

    Tighten:  Tighten the heater pipe bracket bolt to 21 N.m (15 lb ft).

  16. Install the heater pipe to thermostat housing bolt.

    Tighten:  Tighten the heater pipe to thermostat housing bolt to 21 N.m (15 lb ft).

    17. Fig 6: View Of Heater Pipe & Bracket
    GM798886Courtesy of GENERAL MOTORS CORP.
  17. Install the thermostats.
  18. Install the thermostat cover and gasket.
    19. Fig 7: View Of Thermostat, Cover & Bolt
    GM798885Courtesy of GENERAL MOTORS CORP.
  19. Install the thermostat cover bolts.

    Tighten:  Tighten the thermostat cover bolts to 21 N.m (15 lb ft).

  20. Install a new o-ring to the water outlet pipe.
  21. Lubricate the water outlet pipe o-ring with engine coolant.
  22. Install the water outlet pipe.
  23. Install the water outlet pipe bolts.

    Tighten:  Tighten the water outlet pipe bolts to 21 N.m (15 lb ft).

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