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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 862 (Engine Cooling System) >> Repair Instructions >> Thermostat Housing Crossover Replacement (LMM) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Thermostat Housing
    GM1335441Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  1. If necessary, perform the following:
    1. Install NEW seals to the thermostats.
    2. Install the thermostats.
    3. Install the thermostat cover and bolts.

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

    4. Install a NEW O-ring seal to the thermostat bypass pipe.
    5. Install the thermostat bypass pipe to the thermostat housing.
  2. Install a NEW thermostat bypass pipe to water pump O-ring seal.
  3. Install the thermostat housing crossover using NEW gaskets.
  4. Install the thermostat housing crossover bolts and nuts.

    Tighten:  Tighten the bolts/nuts to 21 N.m (15 lb ft).

    5. Fig 2: View Of Water Pump Inlet Pipe Bolts
    GM1335424Courtesy of GENERAL MOTORS CORP.
  5. Install the water pump inlet pipe bolts.

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

    6. Fig 3: View Of Fuel Line Bracket Bolt & Thermostat Housing Crossover (6.6L LMM)
    GM1869891Courtesy of GENERAL MOTORS CORP.
  6. Install the fuel line bracket bolt at the thermostat housing crossover.

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

    7. Fig 4: View Of Turbocharger Coolant Outlet Hose & Clamps
    GM1335429Courtesy of GENERAL MOTORS CORP.
  7. Install the turbocharger coolant return pipe hose.
  8. Position the turbocharger coolant return pipe hose clamp.
    9. Fig 5: View Of Wiring Harness Bracket & Bolts
    GM1874338Courtesy of GENERAL MOTORS CORP.
  9. Install the wiring harness bracket and bolts to the thermostat housing.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

  10. Install the cooling fan pulley. Refer to Cooling Fan Pulley Replacement .
  11. Install the power steering pump bracket. Refer to Air Conditioning (A/C) Compressor and Power Steering Pump Bracket Replacement .
  12. Reposition the power steering pump and install the power steering pump bolts. Refer to Power Steering Pump Replacement (6.6L) .
    13. Fig 6: View Of (ECT) Sensor Electrical Connectors
    GM1875037Courtesy of GENERAL MOTORS CORP.
  13. Install the water outlet. Refer to Water Outlet Tube Replacement (LMM) .
  14. Connect the ECT sensor electrical connectors.
  15. Install the front oil fill tube. Refer to Oil Filler Tube Replacement .
  16. Install the generator bracket. Refer to Generator Bracket Replacement (6.6L) .
    17. Fig 7: View Of A/C Pressure Switch Electrical Connector & A/C Compressor Clutch Electrical Connector
    GM1874992Courtesy of GENERAL MOTORS CORP.
  17. Connect the A/C compressor clutch electrical connector (2).
  18. Connect the A/C cut out switch electrical connector (1).
  19. Install the drive belt. Refer to Drive Belt Replacement .
  20. Connect the negative battery cables. Refer to Battery Negative Cable Disconnection and Connection (w/Single Battery) or Battery Negative Cable Disconnection and Connection (w/Auxiliary Battery) or Battery Negative Cable Disconnection and Connection (w/Dual Batteries) .
  21. Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill)  or Cooling System Draining and Filling (Vac-N-Fill) .
  22. Install the air cleaner. Refer to Air Cleaner Assembly Replacement .
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