Ford XR3Z-8575-BA
Thermostat

Partially draining the cooling system constitutes the first step for servicing and repairing the thermostat. Open the upper radiator hose and move the clamp before splitting the water bypass hose from its water hose connection. Securing the water hose connection requires the removal of two bolts yet you should avoid applying force to that area. After draining the cooling system partially you should disconnect the water hose connection and the water thermostat while removing the thermostat gasket before cleaning all mating surfaces. The new thermostat gasket needs application of Gasket and Trim Adhesive F3AZ-19B508-AA or its equivalent substitute before installation. Insert the new thermostat gasket onto the water hose connection after placing the water thermostat correctly inside the connection slot with the notch properly positioned. Refit both the water hose connection along with the water bypass tube before you place the hose clamps correctly and tighten them properly. Complete the process by replacing the upper radiator hose then filling the cooling system.

You should start the thermostat and thermostat housing repair process by draining the cooling system partially. After unclipping the air cleaner outlet tube you should proceed to remove components following the provided order. Follow the specified procedure step by step when removing each individual part. The service requires performing inverse actions to the removal sequence while finishing with proper cooling system fill-up procedures and bleeding techniques. It is essential to mark the position of the vent pin on the thermostat before you start the disassembly process. Install the thermostat housing-to-engine bolts according to a two-step process by beginning at 8 Nm (71 inch lbs.) then continuing the tightening phase for another 60 degrees.

The thermostat requires servicing by starting with a cool engine state where technicians remove the pressure relief cap from the cooling system or reservoir through a thick cloth that allows slow turning to release pressure before distancing themselves until all pressure has emptied out. Remove the pressure cap with the help of the cloth after confirming there is no more pressure left in the system. Users must prevent the usage of Extended Life Engine Coolant F6AZ-19544-AA that satisfies Ford specification WSS-M97B44-D (orange color) since it causes severe damage to vehicles. The mixture of Standard (green) Coolant with Extended Life Coolant (orange) requires immediate system draining followed by refilling with the originally installed coolant type. Drain the engine cooling system first and after that remove the air cleaner and finish by taking out the bolts and water outlet connector. Remove the thermostat from the water outlet connector and thoroughly clean its two contact areas. Proper orientation of the thermostat must be ensured before installing it into the water outlet adapter using a new gasket. The cooling system requires refilling following installation of the water outlet connector and its bolts. Also reinstall the air cleaner before proceeding.

Draining the cooling system must be the initial step before servicing the thermostat. The service of the thermostat begins by removing the air cleaner outlet tube while disconnecting the upper radiator hose from the thermostat housing. Your next step should be to take off the thermostat housing after discarding its gasket and removing the thermostat housing-to-engine bolts. The bolts should be tightened in two steps starting from 8 Nm (71 inch lbs), followed by another 60 degrees of additional tightening. It is essential to mark the position of the vent pin when removing the thermostat. Reinstall the new thermostat according to the steps used for removal. The service concludes by filling typing and bleeding the cooling system.

Reverse the removal procedure.

Mark the location of the vent pin for proper reinstallation.

First, drain the engine cooling system.

First, drain the engine cooling system.

Fill and bleed the cooling system.