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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1136 (Engine Cooling System) >> Repair Instructions >> Engine Coolant Thermostat Replacement (LY7, LLT) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Partially drain the cooling system. Refer to Cooling System Draining and Filling (GE 47716)  or Cooling System Draining and Filling (Static Fill) .
  2. Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement (LP1, LY7) .
  3. Disconnect the surge tank outlet pipe from the thermostat. Refer to Radiator Surge Tank Outlet Hose/Pipe Replacement (LLT)  or Radiator Surge Tank Outlet Hose/Pipe Replacement (LY7/LLT) .
    4. Fig 1: View Of Coolant Inlet Pipe Bolt Locations
    GM887731Courtesy of GENERAL MOTORS CORP.
  4. Remove the coolant pipe/thermostat housing bolt (2).
  5. Remove the coolant pipe upper bolt (7).
  6. Remove the coolant inlet pipe (4) from the thermostat.
    7. Fig 2: View of Thermostat Assembly
    GM1979701Courtesy of GENERAL MOTORS CORP.
  7. Remove the thermostat bolts (1).
  8. Remove the thermostat (2) and discard the thermostat seal (3).
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