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Replace the thermostat if it is 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 where the thermostat first opens, and where it is fully open.
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Measure the lift height of the thermostat when it is fully open.
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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76−80 °C (169−176 °F)
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Fully Open:
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90 °C (194 °F)
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