Thermostat Test

Replace the thermostat if it is open at room temperature.

To test a closed thermostat:

1.Suspend the thermostat (A) in a container of water. Do not let the thermometer (B) touch the bottom of the hot container.


2.Heat the water, and check the temperature with a thermometer. Check the temperature where the thermostat first opens, and where it is fully open.

3.Measure the lift height of the thermostat when it is fully open.

Standard Thermostat
Lift Height: Above 8.0 mm (0.31 in.) 
Starts Opening: 76-80 °C (169-176 °F) 
Fully Open: 90 °C (194 °F)