Thermostat: Testing and Inspection
ThermostatA new thermostat should be installed only after the mechanical test has been carried out.
Thermostat - Mechanical Test
1. Remove the thermostat.
2. Check the thermostat for seating. Hold the thermostat up to a lighted background. Leakage of light around the thermostat valve at room temperature indicates that a new thermostat should be installed. Some thermostats have a small leakage notch at one location on the perimeter of the thermostat valve, which is considered normal.
3. Immerse the thermostat in a boiling antifreeze and water mixture.
4. Refer to Specifications for thermostat opening temperatures.