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}