Thermostat Inspection

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.

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.
Thermostat initial-opening temperature
- 86.5-89.5 °C {188-193 °F}
Thermostat full-open temperature
- 100 °C {212 °F}
Thermostat full-open lift
- More than 8.5 mm {0.33 in}