Thermostat: Service and Repair

Thermostat - 5.4L (4V)

Thermostat and Thermostat Housing - Exploded View 5.4L (4V) (Part 1):

Thermostat and Thermostat Housing - Exploded View 5.4L (4V) (Part 2):

Removal and Installation
1. Drain the engine cooling system. For additional information, refer to Cooling System Draining, Filling and Bleeding.
2. Remove the 2 bolts and position aside the thermostat housing cover and hose assembly.
^ To install, tighten to 10 Nm (89 lb-in).
3. Remove the O-ring seal and the thermostat.
^ Discard the O-ring seal.
4. To install, reverse the removal procedure.
^ Lubricate the new O-ring seal with clean engine coolant.
5. Fill and bleed the cooling system.