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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Repair Instructions >> Engine Coolant Thermostat Housing Replacement (LUK, LEA) >> Installation Procedure

Installation Procedure

  1. If installing a NEW thermostat housing transfer the thermostat, water inlet and the ECT sensor.
    2. Fig 1: Thermostat Cover Fasteners
    GM2674370Courtesy of GENERAL MOTORS COMPANY
  2. Install a NEW thermostat cover O-ring seal into the recess groove.
  3. Install the thermostat (3), if necessary.
    4. CAUTION:

    Refer to Fastener Caution .

  4. Install the thermostat cover fasteners (1), if necessary and tighten to 10 N.m (89 lb in).
  5. Install a NEW thermostat housing to engine gasket onto the thermostat housing.
  6. Load the thermostat housing assembly into position.
    7. Fig 2: Thermostat Housing Fasteners
    GM2680481Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The water feed pipe seals can be lightly lubricated with coolant to aid during installation.

  7. Install NEW O-ring seals (4) onto the water feed pipe (5).
    8. NOTE:

    Lubricate the O-rings with coolant ONLY.

  8. Install the water feed pipe (5) into the thermostat housing aligning locator tab.
  9. Align the water pipe (5) to water pump.
  10. Seat the water feed O-ring seal by pushing inward toward the water pump. Take care not to tear or damage the O-ring.
  11. Position the thermostat housing (2) against the engine with a NEW seal (3).
  12. Install the thermostat housing fasteners (1) and tighten to 10 N.m (89 lb in).
  13. Install the ECT sensor, if necessary and tighten to 20 N.m (15 lb ft).
    14. Fig 3: Thermostat Housing
    GM2680478Courtesy of GENERAL MOTORS COMPANY
  14. Install the following hoses from the thermostat housing (6):
    • Radiator Outlet Hose (1)
    • Surge Tank Hose (2)
    • Heater Outlet Hose (3)
    • Heater Inlet Hose (4)
  15. Connect the Engine Coolant Temperature (ECT) sensor (5).
    16. Fig 4: Opening Water Pump Drain Plug
    GM1212666Courtesy of GENERAL MOTORS COMPANY
  16. Verify the drain valves at the radiator and water pump are closed.
  17. Fill the cooling system. Refer to Cooling System Draining and Filling (GE 47716) .
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