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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1284 (Engine Cooling System) >> Repair Instructions >> Thermostat Housing Crossover Replacement (LMM) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis 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.
    CAUTION: Refer to Fastener Caution .
  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 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 (With Single Battery) or Battery Negative Cable Disconnection and Connection (With Auxiliary Battery) or Battery Negative Cable Disconnection and Connection (With Dual Batteries) .
  21. Fill the cooling system. Refer to Cooling System Draining and Filling (Vac-N-Fill)  or Cooling System Draining and Filling (Static Fill) .
  22. Install the air cleaner. Refer to Air Cleaner Assembly Replacement .
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