Thermoswitch test?

Is there any way to bench test the thermoswitch assy and Thermo unit in the thermostat unit. I'm rebuilding one. Was going to replace them as a precaution till I saw the price. If I can bench test them I'd reuse.

 

Here are the procedures for the testing of the temp gauge sending unit (the "thermo unit" with the single electrical terminal) and the fan control switch (the "thermoswitch", which has 2 electrical terminals):

Thermo unit:

1) do not drop this sensor! If dropped/shocked, it should be replaced, regardless of testing to specifications or not!!

2) Testing: immerse in cool water. Attached ohmmeter leads (+ lead to terminal, - lead to body of unit) and slowly heat the water. Measure the resistance at various temps. Specified values are:

156 ohms resistance at water temp = 122F
28.4 ohms resistance at water temp = 212F
17 ohms resistance at water temp = 248F

Make sure your thermometer is accurate!



Thermoswitch:

1) do not drop this sensor! If dropped/shocked, it should be replaced, regardless of testing to specifications or not!!

2) Testing: immerse in cool oil. Attached ohmmeter leads (+ lead to one terminal, - lead to other terminal) and slowly heat the oil. Measure the resistance at various temps. Specified values are:

Heat-up tests:
infinite resistance at oil temp between 32F - 208.4F
0 ohms resistance at oil temp between 215.6 - 226.4F

Cool-down tests:
0 ohms resistance at oil temp between 226.4 - 208.4F
infinite resistance at oil temp between 208.4 - 32F

Make sure your thermometer is accurate