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Engine Cooling Fan: Testing: Thermostat

  1. Visually inspect thermostat for corrosion and propersealing. If satisfactory, suspend thermostat and thermometer in container of water. Do not allow either thermostat or thermometer to touch bottom of container as concentration of heat could cause an incorrect reading.
  2. Heat water until thermostat just begins to open. Note temperature at which thermostat begins to open. Replace thermostat if it does not open.
    Fig 1: Testing Thermostat
    G91257
    NOTE: Thermostat should open as water is heated.
    NOTE: Some models use plastic or aluminum components in radiators. Ensure proper cleaning solution is used.
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