Section 4 (Engine Cooling System (2AZ-FE)): Thermostat: Inspection

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INSPECT THERMOSTAT
1. The valve opening temperature is inscribed on the thermostat.
  
  Fig 1: Inspecting Thermostat
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Immerse the thermostat in water, and then gradually heat the water.
3. Check the valve opening temperature of the thermostat.
  Standard valve opening temperature:
  
  80 to 84°C (176 to 183°F)
  
  If the valve opening temperature is not as specified, replace the thermostat.
  
  Fig 2: Checking Valve Opening Temperature Of Thermostat
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the valve lift.
  Standard valve lift:
  
  10 mm (0.39 in.) or more at 95°C (203°F)
  
  If the valve lift is not as specified, replace the thermostat.
5. Check that the valve is fully closed when the thermostat is at low temperatures (below 77°C (171°F)).
  If it is not fully closed, replace the thermostat.
  
  Fig 3: Checking Valve Lift
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002