Section 8 (Engine Cooling System (1AR-FE)): Thermostat: Inspection

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INSPECT THERMOSTAT
HINT:

The valve opening temperature is inscribed on the thermostat.

Fig 1: Identifying Thermostat
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1. Immerse the thermostat in water, and then gradually heat the water.
2. Check that the valve of the thermostat opens at the specified temperature.
  Standard valve opening temperature:
  
  80 to 84°C (176 to 183°F)
  
  If the valve does not open as specified, replace the thermostat.
  
  Fig 2: Checking Valve Opening Temperature Of Thermostat
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. 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.
4. Check that the valve is fully closed when the thermostat is at a low temperature (below 77°C (171°F)).
  If the valve is not fully closed, replace the thermostat.
Fig 3: Checking Valve Lift
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002