Crown Victoria V8-4.6L SOHC VIN W (2005)
Thermostat: Testing and Inspection
Thermostat Coolant
A new coolant thermostat should be installed only after the following mechanical test has been carried out.
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 a new coolant thermostat should be installed. 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.
