Thermostat: Testing and Inspection
TESTINGReplace the thermostat if it is open at room temperature.
To test a closed thermostat:
1. Suspend the thermostat in a container of water as shown.
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.
CAUTION: Do not let the thermometer touch the bottom of the hot container.
3. Measure lift height of the thermostat when it is fully open.
STANDARD THERMOSTAT
Lift height: above 8.0 mm (0.31 inch)
Starts opening: 169 -176° F (76 - 80° C)
Fully open: 194° F (90° C)