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Home >> Ford >> 2004 >> Excursion 6.8 S, 4WD >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System - Excursion & F250-F550 Super Duty >> Diagnosis And Testing >> Engine Cooling >> Thermostat - Coolant >> Thermostat - Mechanical Test

Thermostat - Mechanical Test

  1. Remove the coolant thermostat.
  2. Check the coolant thermostat for seating. Hold the coolant thermostat up to a lighted background. Leakage of light around the thermostat valve at room temperature indicates that the coolant thermostat should be replaced. Some coolant thermostats have a small leakage notch at one location on the perimeter of the thermostat valve, which is considered normal.
  3. Immerse the coolant thermostat in a boiling antifreeze and water mixture.
  4. See the GENERAL SPECIFICATIONS  chart for coolant thermostat opening temperatures.
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