4 Runner 4WD V8-4.7L (2UZ-FE) (2003)
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Thermostat: Testing and Inspection
THERMOSTAT INSPECTION
HINT: The thermostat is numbered with the valve opening temperature.
a. Immerse the thermostat in water an gradually heat the water.
b. Check the valve opening temperature.
Valve opening temperature: 80 - 84°C (176 - 183°F)
If the valve opening temperature is not as specified, replace the thermostat.
c. Check the valve lift.
Valve lift: 10 mm (0.39 inch) or more at 95°C (203°F)
If the valve lift is not as specified, replace the thermostat.
d. Check that the valve is fully closed when the thermostat is at low temperatures (below 77°C (171°F)). If not closed, replace the thermostat.
