Thermostat (FA20/For Engine Coolant): Inspection

Thermostat check

Check that the valve is fully closed when the thermostat is at 83°C {181°F} or less.
NOTE: Replace the thermostat if the valve is not fully closed.

Immerse the thermostat in water and heat it gradually.

NOTE: Hold the thermostat with a wire or the like to avoid contacting with container bottom.

Courtesy of SUBARU OF AMERICA, INC.

Check the temperature when the valve starts to open.
Standard value: 86 to 90°C {187 to 194°F}

NOTE: Replace the thermostat if the temperature when the valve opens is outside the standard range.

Check the valve lift.

Courtesy of SUBARU OF AMERICA, INC.

Standard value: Lift 8mm {0.315 in} or more Full open temperature 95°C {203°F}

NOTE: Replace the thermostat if the valve lift is outside the standard range.