GM Service Manual Online
For 1990-2009 cars only

Engine Coolant Thermostat Replacement LE5

Removal Procedure


    Object Number: 1714037  Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling.
  2. Remove the air inlet grille panel. Refer to Air Inlet Grille Panel Replacement.
  3. Reposition the radiator outlet hose clamp at the thermostat housing.
  4. Remove the radiator outlet hose from the thermostat housing.
  5. Remove the radiator outlet hose clip (1) from the outlet hose bracket.

  6. Object Number: 1713064  Size: SH
  7. Remove the thermostat housing cover bolts and cover.
  8. Remove the thermostat.
  9. Remove and discard the thermostat housing O-ring seal.

Installation Procedure


    Object Number: 1713064  Size: SH
  1. Install a NEW thermostat housing cover O-ring seal onto the housing.
  2. Install the thermostat.
  3. Caution: Refer to Fastener Caution in the Preface section.

  4. Install the thermostat housing cover and bolts.
  5. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1714037  Size: SH
  6. Install the radiator outlet hose to the thermostat housing.
  7. Reposition the radiator outlet hose clamp at the thermostat housing.
  8. Install the radiator outlet hose clip (1) to the outlet hose bracket.
  9. Install the air inlet grille panel. Refer to Air Inlet Grille Panel Replacement.
  10. Fill the cooling system. Refer to Cooling System Draining and Filling.

Engine Coolant Thermostat Replacement LNF

Removal Procedure


    Object Number: 1826444  Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling.
  2. Remove the air inlet grille panel. Refer to Air Inlet Grille Panel Replacement.
  3. Reposition the radiator outlet hose clamp (1) at the thermostat housing.
  4. Remove the radiator outlet hose from the thermostat housing.

  5. Object Number: 1713064  Size: SH
  6. Remove the thermostat housing cover bolts and cover.
  7. Remove the thermostat.
  8. Remove and discard the thermostat housing O-ring seal.

Installation Procedure


    Object Number: 1713064  Size: SH
  1. Install a NEW thermostat housing cover O-ring seal onto the housing.
  2. Install the thermostat.
  3. Caution: Refer to Fastener Caution in the Preface section.

  4. Install the thermostat housing cover and bolts.
  5. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 1826444  Size: SH
  6. Install the radiator outlet hose to the thermostat housing.
  7. Reposition the radiator outlet hose clamp (1) at the thermostat housing.
  8. Install the air inlet grille panel. Refer to Air Inlet Grille Panel Replacement.
  9. Fill the cooling system. Refer to Cooling System Draining and Filling.