Thermostat Inspection

Remove the thermostat. (See THERMOSTAT REMOVAL/INSTALLATION .)
Visually check that the thermostat valve is closed.
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.
Heat the water and check the following.
- Opening temperature and valve lift
  - If there is a malfunction, replace the thermostat. (See THERMOSTAT REMOVAL/INSTALLATION .)
  Thermostat initial-opening temperature
- 80-84 °C {176-183 °F}
  Thermostat full-open temperature
- 97 °C {207 °F}
  Thermostat full-open lift
- More than 8.0 mm {0.31 in}