Ford 5F9Z-8575-A
Thermostat

The servicing process of the thermostat begins by properly removing the thermostat housing. When installing the thermostat maintain alignment of the device with inner marks on the upper thermostat housing because you will return it to its initial placement. Start by removing the upper and lower thermostat housing through removal of its three bolts. Then extract the thermostat from its housing. Perform the removal of the thermostat after discarding the O-ring seal. When installing the thermostat position its bridge exactly on the marks within the upper thermostat housing to avoid blocking the coolant inlet tube with the spring retainer. Before putting a new O-ring seal into the upper housing apply clean engine coolant as lubricant. Reinstall the lower thermostat housing by using three bolts that need tightening to 10 Nm (89 lb-in) before placing the thermostat housing. The cooling system needs to be filled and its air needs to be bled before completing the process.

Start the thermostat service procedure by taking off the housing unit. Always keep the thermostat in proper alignment with the inner marks found within the upper thermostat housing before replacing it back to its original position. Prompt service and repair of the thermostat requires removing three bolts from the thermostat housing followed by separating the housing into upper and lower parts before discarding the O-ring seal. To install the thermostat correctly position the thermostat bridge on the marks of the upper housing to stop the spring retainer from obstructing the coolant entry tube. Insert a new O-ring seal into the upper housing after lubricating it with clean engine coolant. Norton the lower thermostat housing to its place using three bolts secured at 10 Nm (89 inch lbs.) and finally connect the thermostat housing assembly. The cooling system requires a final completion by filling it up and performing a bleeding procedure.

Lubricate a new O-ring seal with clean engine coolant and place it in the upper housing.