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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) >> Removal Procedure

Removal 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 A/C Pressure Switch Electrical Connector & A/C Compressor Clutch Electrical Connector
    GM1874992Courtesy of GENERAL MOTORS CORP.
  1. Remove the air cleaner. Refer to Air Cleaner Assembly Replacement .
  2. Drain the cooling system. Refer to Cooling System Draining and Filling (Vac-N-Fill)  or Cooling System Draining and Filling (Static Fill) .
  3. Disconnect 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) .
  4. Remove the drive belt. Refer to Drive Belt Replacement .
  5. Disconnect the air conditioning (A/C) pressure switch electrical connector (1).
  6. Disconnect the A/C compressor clutch electrical connector (2).
  7. Remove the generator bracket. Refer to Generator Bracket Replacement (6.6L) .
  8. Remove the front oil fill tube. Refer to Oil Filler Tube Replacement .
    9. Fig 2: View Of (ECT) Sensor Electrical Connectors
    GM1875037Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the engine coolant temperature (ECT) sensor electrical connectors.
  10. Remove the water outlet. Refer to Water Outlet Tube Replacement (LMM) .
  11. Without disconnecting the power steering hoses, remove the power steering pump bolts and the power steering pump. Reposition the power steering pump and secure to the side. Refer to Power Steering Pump Replacement (6.6L) .
  12. Remove the power steering pump bracket. Refer to Air Conditioning (A/C) Compressor and Power Steering Pump Bracket Replacement .
    13. Fig 3: View Of Wiring Harness Bracket & Bolts
    GM1874338Courtesy of GENERAL MOTORS CORP.
  13. Remove the bolts and wiring harness bracket at the thermostat housing.
  14. Position the bracket and wiring harness aside.
  15. Remove the cooling fan pulley. Refer to Fan Pulley Replacement .
    16. Fig 4: View Of Turbocharger Coolant Outlet Hose & Clamps
    GM1335429Courtesy of GENERAL MOTORS CORP.
  16. Reposition the turbocharger coolant return pipe hose clamp.
  17. Remove the turbocharger coolant return pipe hose.
    18. Fig 5: View Of Fuel Line Bracket Bolt & Thermostat Housing Crossover (6.6L LMM)
    GM1869891Courtesy of GENERAL MOTORS CORP.
  18. Remove the fuel line bracket bolt at the thermostat housing crossover.
    19. Fig 6: View Of Water Pump Inlet Pipe Bolts
    GM1335424Courtesy of GENERAL MOTORS CORP.
  19. Remove the water pump inlet pipe bolts.
    20. Fig 7: View Of Thermostat Housing
    GM1335441Courtesy of GENERAL MOTORS CORP.
  20. Remove the thermostat housing crossover bolts and nuts.
  21. Remove the thermostat housing crossover, with the bypass pipe.
  22. Remove and discard the thermostat bypass pipe to water pump O-ring seal.
  23. Remove and discard the thermostat housing crossover gaskets.
  24. If necessary, perform the following:
    1. Remove the thermostat bypass pipe from the thermostat housing crossover.
    2. Remove and discard the thermostat bypass pipe O-ring seal.
    3. Remove the thermostat cover bolts and cover.
    4. Remove the thermostats.
    5. Remove and discard the thermostat seals.
  25. If required, clean and inspect the thermostat housing. Refer to Engine Coolant Thermostat Housing Cleaning and Inspection .
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