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Thermostat Test

Replace the thermostat if it is open at room temperature.
To test a closed thermostat:
  1. Suspend the thermostat (A) in a container of water. Do not let the thermometer (B) touch the bottom of the hot container.
  1. Heat the water, and check the temperature with a thermometer. Check the temperature where the thermostat first opens, and where it is fully open.
  1. Measure the lift height of the thermostat when it is fully open.

    Standard Thermostat

    Lift Height:
    Above 8.0 mm (0.31 in.)
    Starts Opening:
    76−80 °C (169−176 °F)
    Fully Open:
    90 °C (194 °F)