Thermostat Test, Mechanical

Thermostat Test, Mechanical

NOTE: Fully open means the thermostat valve lifts a distance of 9.0 mm (0.35 inch) or more off the valve seat.

1. Remove the thermostat.
2. Immerse the thermostat in water.
3. Increase the temperature of the water.
4. Observe the state of the thermostat and the temperature of the water.
5. The thermostat should begin to open at 82°C (179°F) and is fully open at 93°C (199°F).
6. If the thermostat fails to open within acceptable limits, install a new thermostat.