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Thermostat - Mechanical Test

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the thermostat.
  2. Check the thermostat for seating. Hold the thermostat up to a lighted background. Leakage of light around the thermostat valve at room temperature indicates that a new thermostat should be installed. Some thermostats have a small leakage notch at one location on the perimeter of the thermostat valve, which is considered normal.
  3. Immerse the thermostat in a boiling antifreeze and water mixture.
  4. See the GENERAL SPECIFICATIONS  for thermostat opening temperatures.
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