Thermostat: Service and Repair

Thermostat-4.6L, 5.4L and 6.8L

Removal and Installation
1. Drain the cooling system.
2. Remove the air cleaner and air cleaner outlet tube.





3. Remove the bolts and the thermostat housing.
^ Position the thermostat housing aside.





4. Remove the O-ring seal and thermostat.
^ Clean and inspect the sealing surfaces.
5. To install, reverse the removal procedure.