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) |