Toyota Sienna 2000-06

Removal & Installation

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  1. Disconnect the negative battery cable.
  2.  
  3. Drain and recycle the engine coolant.
  4.  
  5. Remove the air cleaner cap with the hose.
  6.  
  7. Disconnect the engine coolant temperature sensor(s) connectors.
  8.  
  9. Disconnect the engine wire protector from the water inlet and cylinder head.
  10.  
  11. Remove the bolt and disconnect the water inlet pipe from the water inlet. Remove the O-ring from the inlet.
  12.  
  13. Remove the 3 nuts, water inlet and the thermostat.
  14.  
  15. Remove the thermostat gasket and clean the gasket mating surfaces.
  16.  

To install:

  1. Install a new thermostat gasket then place the thermostat in position. The thermostat jiggle valve must be aligned with the upper stud bolt.
    NOTE
    The jiggle valve must be within 15 degrees of either side of the stud bolt.

  2.  
  3. Install the water inlet and tighten the nuts to 69 inch lbs. (8 Nm).

    Click image to see an enlarged view

    Fig. The jiggle valve must be within 15 degrees of either side of the stud bolt-Sienna

  4.  
  5. Install a new O-ring on the water inlet pipe. Apply soapy water to the O-ring prior to installation.
  6.  
  7. Attach the inlet pipe to the water inlet. Tighten the bolt retaining the water inlet to the cylinder head to 14 ft. lbs. (19 Nm).
  8.  
  9. Install the engine wire protector and engine coolant temperature switch connectors.
  10.  
  11. Install the air cleaner cap and hose.
  12.  
  13. Fill the cooling system
  14.  
  15. Start the vehicle, check for leaks and recheck coolant level.
  16.  

  1. Disconnect the negative battery cable.
  2.  
  3. Drain and recycle the engine coolant.
  4.  
  5. Remove the battery.
  6.  
  7. Remove the air cleaner assembly and bracket.
  8.  
  9. Remove the starter motor.
  10.  
  11. Disconnect the wire harness clamp from the water inlet.
  12.  
  13. Remove the 3 nuts, water inlet and the thermostat.
  14.  
  15. Remove the thermostat gasket and clean the gasket mating surfaces.
  16.  

To install:

  1. Install a new thermostat gasket then place the thermostat in position. The thermostat jiggle valve must be aligned with the upper stud bolt.
    NOTE
    The jiggle valve must be within 15 degrees of either side of the stud bolt.

  2.  
  3. Install the water inlet and tighten the nuts to 71 inch lbs. (8 Nm) for the nut and 14 ft. lbs. (20 Nm) for the bolt.
  4.  
  5. Install the starter.
  6.  
  7. Connect the wire harness clamp to the water inlet.
  8.  
  9. Install the air cleaner bracket, air cleaner assembly and hose.
  10.  
  11. Fill the cooling system
  12.  
  13. Start the vehicle, check for leaks and recheck coolant level.
  14.  

 
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