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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1949 (Engine Cooling System) >> Repair Instructions >> Engine Coolant Thermostat Housing Replacement (LAT) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Opening Water Pump Drain Plug
    GM1212666Courtesy of GENERAL MOTORS CORP.
  1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill With HP5)  or Cooling System Draining and Filling (Static Fill Without HP5)  or Cooling System Draining and Filling (GE 47716 Fill With HP5)  or Cooling System Draining and Filling (GE 47716 Fill Without HP5) .
    2. NOTE: A drain has been provided at the bottom of the water pump for engine block coolant drainage.
  2. Drain the coolant from the engine block at the water pump drain. After the coolant has drained, tighten the drain bolt.
  3. Lower the vehicle.
  4. Remove the battery tray.
    5. Fig 2: Identifying Engine Wiring Harness Electrical Connector
    GM1812206Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the engine wiring harness electrical connector (1) from the engine coolant temperature (ECT) sensor.
  6. Remove the heated oxygen sensor (HO2S) electrical connector rosebud clip from the thermostat housing.
    7. Fig 3: View Of Radiator Outlet Hose
    GM1812217Courtesy of GENERAL MOTORS CORP.
  7. Reposition the radiator outlet hose clamp at the thermostat cover.
  8. Remove the radiator outlet hose from the thermostat cover.
    9. Fig 4: Identifying Exhaust Manifold Heat Shield
    GM1631387Courtesy of GENERAL MOTORS CORP.
  9. Remove the exhaust heat shield studs (2).
  10. Remove the exhaust heat shield.
    11. Fig 5: View Of Auxiliary Heater Water Pump & Heater Hoses
    GM1812209Courtesy of GENERAL MOTORS CORP.
  11. Remove the auxiliary heater water pump hose clip (1) from the heater outlet hose.
  12. Reposition the auxiliary heater water pump hose clamp at the thermostat housing.
  13. Remove the auxiliary heater water pump hose (2) from the thermostat housing.
  14. Reposition the heater inlet hose clamp at the thermostat housing.
  15. Remove the heater inlet hose (3) from the thermostat housing.
  16. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
    17. Fig 6: Locating ECT Sensor
    GM1812215Courtesy of GENERAL MOTORS CORP.
  17. Remove the ECT sensor, if necessary.
    18. Fig 7: Identifying Thermostat Housing Bolts
    GM1713067Courtesy of GENERAL MOTORS CORP.
  18. Remove the thermostat housing bolts.
    19. NOTE: Twist the water transfer pipe while pulling in order to remove it from the water pump.
  19. Remove the thermostat from the vehicle.
  20. Remove the water transfer pipe from the thermostat housing, if necessary.
  21. Remove and discard the water transfer pipe O-ring seals, if necessary.
    22. Fig 8: Identifying Thermostat Housing Cover Bolts & Cover
    GM1713064Courtesy of GENERAL MOTORS CORP.
  22. Remove the thermostat cover bolts and cover, if necessary.
  23. Remove the thermostat, if necessary.
  24. Remove and discard the thermostat cover O-ring seal, if necessary.
  25. Remove all debris and thread sealant from the engine coolant temperature (ECT) sensor and bolt holes if the housing is being re-used.
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