Engine Compression & Cooling System Tools

How do you test a mechanical engine Thermostat for sticking closed on a workbench?

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 Correct IncorrectSubmerge the thermostat in a pot of water on a stove with a calibrated candy/meat thermometer: observe the temperature at which the wax pellet expands to fully open the spring valve.

How do you test a mechanical engine Thermostat for sticking closed on a workbench?

• Hold a lighter flame directly on the metal frame
• Tap it with a brass hammer
• Measure its electrical resistance with an ohmmeter
• Submerge in heating water with a thermometer and record the exact temperature the valve opens and fully strokes