Section 9 (Cooling (2GR-FSE)): Thermostat: Inspection

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT WATER INLET WITH THERMOSTAT SUBASSEMBLY
1. The valve opening temperature is marked on the water inlet with thermostat sub-assembly.
  
  Fig 1: Identifying Thermostat Opening Temperature
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Submerge the water inlet with thermostat subassembly, and then gradually heat the water.
3. Check the valve opening temperature.
  Valve opening temperature: 80 to 84°C (176 to 183°F)
  
  Fig 2: Checking Valve Opening Temperature
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  The valve opening temperature is stamped on the water inlet with thermostat.
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