THERMOSTAT INSPECTION [MZI-3.7]

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1.  Remove the thermostat. (See THERMOSTAT REMOVAL/INSTALLATION [MZI-3.7].)

2.  Visually check that the thermostat valve is closed.

3.  Place the thermostat in water.

Warning
•  During inspection, the thermostat and water are extremely hot and can cause severe burns. Do not touch the thermostat and water.

4.  Heat the water and check the following.

•  Opening temperature and valve lift
―  If there is a malfunction, replace the thermostat. (See THERMOSTAT REMOVAL/INSTALLATION [MZI-3.7].)
Thermostat initial-opening temperature
79.5—83.3 °C {175.2—181.9 °F}
Thermostat full-open temperature
94.5 °C {202.1 °F}
Thermostat full-open lift
More than 8.1 mm {0.32 in}