Inspection [12/2015 - 08/2016]: Procedure

WARNING: This page is about a different car, the 2016 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT THERMOSTAT

Inspect the thermostat.

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HINT:

The valve opening temperature is inscribed on the thermostat.

Immerse the thermostat in water and gradually heat the water.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the valve opening temperature.
Standard valve opening temperature

80 to 84°C (176 to 183°F)

If the valve opening temperature is not as specified, replace the thermostat.

Check the valve lift.

Standard valve lift

10 mm (0.394 in.) or more at 95°C (203°F)

If the valve lift is not as specified, replace the thermostat.

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.