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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 655 (Engine Cooling System - Excursion & F250-F550 Super Duty) >> Diagnosis And Testing >> Engine Cooling >> Thermostat - Coolant >> Thermostat - Mechanical Test

Thermostat - Mechanical Test

WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  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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