Thermostat: Service and Repair

REMOVAL
1. Partially drain the cooling system so that the coolant level is below the water thermostat (8575).
2. Disconnect upper radiator hose (8260) at the water hose connection (8592).
3. Remove two water outlet connection retaining bolts and remove water hose connection and water hose connection gasket (8255).

INSTALLATION
1. Clean sealing surface on water hose connection and on intake manifold (9424).
2. Position water thermostat, and water hose connection on the intake manifold. Install the two retaining bolts and tighten to 8- 12 Nm (71 - 106 lb. in).

NOTE: To prevent incorrect installation of the water thermostat, the water hose connection on all engines contains an alignment slot which the water thermostat assembly fits it. Install the water thermostat with the bridge section in the water hose connection. Turn the water thermostat clockwise to lock it in position on the flats cast into the water hose connection.

3. Connect upper radiator hose to water hose connection. Move new hose clamp to water hose connection. Make sure clamp is between alignment marks on hose.
4. Fill cooling system with a 50/50 mixture of Premium Cooling System Fluid E2FZ-19549-AA or-B (in Oregon, F5FZ-19549-CC), recycled coolant or equivalent meeting Ford specification ESE-M97B44-A.
5. Start engine and check all hoses and connections for leaks.