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 at which the thermostat first opens, and at which it is fully open.

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

Lift height: above 8.0 mm (0.31 in.) 
Starts opening: 76-80°C (169-176°F) 
Fully open: 90°C (194°F)