Lexus GS, SC 1998-06

Removal & Installation

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1uz-FE Engine



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable. Wait at least 90 seconds before performing any other work.
  4.  
  5. Drain the engine coolant.
  6.  
  7. Remove the battery clamp cover and air cleaner inlet.
  8.  
  9. Remove the 3 nuts holding the water inlet to the inlet housing, and disconnect the water inlet together with the radiator hose from the water inlet housing.
  10.  
  11. Remove the thermostat.
  12.  
  13. Remove the gasket from the thermostat.
  14.  

To install:

Click image to see an enlarged view

Fig. Correct alignment of the thermostat jiggle valve.-1UZ-FE engine

  1. Install a new gasket to the thermostat.
  2.  
  3. Insert the thermostat into the water inlet housing with the jiggle valve facing straight upward. The jiggle valve may be set within 30° of either side of the prescribed position.
  4.  
  5. Install the water inlet with thermostat with the 3 nuts. Tighten the 3 nuts to 13 ft. lbs. (18 Nm).
  6.  
  7. Refill the engine coolant.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Start the engine and check cooling system for leaks.
  12.  
  13. Check the coolant level and add if necessary.
  14.  
  15. Install the battery clamp cover and air cleaner inlet.
  16.  

2jz-Ge Engine



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable. Wait at least 90 seconds before performing any other work.
  4.  
  5. Drain the engine coolant.
  6.  
  7. Remove the 2 nuts holding the water inlet to the water pump, and disconnect the water inlet from the water pump.
  8.  
  9. Remove the thermostat.
  10.  
  11. Remove the gasket from the thermostat.
  12.  

To install:

Click image to see an enlarged view

Fig. Correct alignment of the thermostat jiggle valve.-2JZ-GE engine

  1. Install a new gasket to the thermostat.
  2.  
  3. Align the jiggle valve of the thermostat with the protrusion of the water inlet.
  4.  
  5. Install the water inlet with the 2 nuts and tighten to 80 inch lbs. (9 Nm).
  6.  
  7. Refill the engine coolant.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Start the engine and check cooling system for leaks.
  12.  

3gr-Fse Engines



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable. Wait at least 90 seconds before performing any other work.
  4.  
  5. Remove engine under cover.
  6.  
  7. Remove the cool air intake duct seal.
  8.  
  9. Remove the bolt and No. 1 air cleaner inlet.
  10.  
  11. Remove the 2 nuts and the V-bank cover sub-assembly.
  12.  
  13. Drain the engine coolant.
  14.  
  15. Disconnect the hose from the water inlet with thermostat.
  16.  
  17. Remove the 3 nuts, water inlet with thermostat and gasket.

    Click image to see an enlarged view

    Fig. Exploded view of thermostat assembly and related components.-3GR-FSE engine

  18.  

To install:

  1. Install a new gasket and the water inlet with thermostat with the 3 nuts. Tighten the 3 nuts to 7 ft. lbs. (10 Nm).
  2.  
  3. Connect the radiator outlet hose to the radiator assembly and secure it with the clip. Make sure that the claws on the clip are positioned outward with space between the hose end and the clip end should be less than 1-5mm. Hose contact with the stopper should be less than 2.5mm.
  4.  
  5. Refill the engine coolant.
  6.  
  7. Connect the negative battery cable.
  8.  
  9. Start the engine and check cooling system for leaks.
  10.  
  11. Install the V-bank cover sub-assembly and tighten the 2 nuts to 44 inch lbs. (5 Nm).
  12.  
  13. Install the No. 1 air cleaner inlet. Tighten the bolt to 44 inch lbs. (5 Nm).
  14.  
  15. Install the cool air intake duct seal.
  16.  
  17. Install engine under cover.
  18.  
  19. Perform system initialization procedure.
  20.  

3uz-FE Engine



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Disconnect the negative battery cable. Wait at least 90 seconds before performing any other work.
  4.  
  5. Remove the air cleaner inlet No. 1.
  6.  
  7. Drain the engine coolant.
  8.  
  9. Remove the 3 nuts and disconnect the water inlet from the water inlet housing.
  10.  
  11. Remove the thermostat.
  12.  
  13. Remove the gasket from the thermostat.
  14.  

To install:

Click image to see an enlarged view

Fig. Correct alignment of the thermostat jiggle valve.-3UZ-FE engine

  1. Install a new gasket to the thermostat.
  2.  
  3. Insert the thermostat into the water inlet housing with the jiggle valve facing straight upward. The jiggle valve may be set within 30° of either side of the prescribed position.
  4.  
  5. Install the water inlet with the 3 nuts and tighten to 14 ft. lbs. (19 Nm).
  6.  
  7. Refill the engine coolant.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Start the engine and check cooling system for leaks.
  12.  
  13. Install the air cleaner inlet No. 1.
  14.  
  15. Check the coolant level and add if necessary.
  16.  

 
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