Section 55 (Cooling (2GR-FSE)): Thermostat: Inspection

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY
1. The valve opening temperature is marked on the water inlet with thermostat sub-assembly.
  
  Fig 1: Identifying Valve Opening Temperature Marked On Water Inlet With Thermostat Sub-Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Submerge the water inlet with thermostat sub-assembly, and then gradually heat the water.
3. Check the valve opening temperature.
  Valve opening temperature:
  
  80 to 84°C (176 to 183°F)
  
  HINT:
  
  The valve opening temperature is stamped on the water inlet with thermostat.
  
  Fig 2: Checking Valve Opening Temperature
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the valve lift.
  Valve lift:
  
  8.0 mm (0.315 in.) or more at 95°C (203°F)
  
  HINT:
  
  If the valve lift value is not as specified, replace the water inlet with thermostat sub-assembly.
5. When the temperature of the water inlet with thermostat sub-assembly drops below 77°C, check that the valve is fully closed.
  HINT:
  
  If the valve is not fully closed, replace the water inlet with thermostat sub-assembly.
  
  Fig 3: Checking Valve Lift
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002