F 250 4WD LD Pickup V8-5.4L SOHC VIN L (1997)
Thermostat: Specifications
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The water thermostat should initially open at 87-91° C (188-195° F), and be fully opened at 100° C (212° F).
NOTE: "Fully open" means the water thermostat lifts a distance of 8.0 mm (0.31 in) or more.
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The water thermostat should be closed at 85° C (185° F).