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Replace the thermostat if it is stuck open at room temperature.
To test a closed thermostat:
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Suspend the thermostat (A) in a container of water. Do not let the thermometer (B) touch the bottom of the hot container.
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Heat the water and check the temperature with a thermometer. Check the temperature when the thermostat first opens, then check the temperature when the thermostat is fully open.
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Measure the lift height of the thermostat when it is fully open. If the thermostat is not within the specification, replace it.
Standard Thermostat
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Lift Height:
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Above 8.0 mm (0.31 in.)
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Starts Opening:
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80−84 °C (176−183 °F)
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Fully Open:
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95 °C (203 °F)
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