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Home >> Mazda >> 2021 >> MX-5 Miata Club, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Cooling System) >> Thermostat Inspection

Thermostat Inspection

WARNING: This page is about a different car, the 2016 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the thermostat. (See THERMOSTAT REMOVAL/INSTALLATION .)
  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.
      Fig 1: Identifying Thermostat, Jiggle Pin And Part Number
      G10951641Courtesy of MAZDA MOTORS CORP.

    Thermostat initial-opening temperature 

    • 86.5-89.5 °C {188-193 °F}

    Thermostat full-open temperature 

    • TypeA: 95 °C {203 °F}
    • TypeB: 100 °C {212 °F}

    Thermostat full-open lift 

    • TypeA: 8.5-11 mm {0.34-0.43 in}
    • TypeB: 8.5 mm {0.33 in} or more