4 Runner 2WD V6-4.0L (1GR-FE) (2006)
Thermostat: Testing and Inspection
INSPECT WATER INLET W/ THERMOSTAT
HINT: The valve opening temperature is inscribed on the thermostat.
a. Immerse the thermostat in water and heat the water gradually.
b. Check the valve opening temperature of the thermostat.
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: 8 mm (0.31 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 temperature (below 40°C (104°F)).
If not closed, replace the thermostat.