Cooling System: Description and Operation
Engine CoolingCAUTION: Always fill the cooling system with the same type of coolant that is present in the system. Do not mix coolant types. Mixing coolant types can result in cooling system damage.
The cooling system components include the following:
^ Block heater
^ Fan blade
^ Fan clutch
^ Fan shroud
^ Radiator
^ Degas bottle
^ Pressure relief cap
^ Radiator draincock
^ Coolant pump
^ Coolant thermostat
^ Oil filter adapter
^ Upper radiator hose
^ Lower radiator hose
^ Degas bottle supply hose
^ Fan stator - 6.4L
^ Exhaust gas recirculation (EGR) coolers - 6.4L
^ Engine oil cooler - 6.4L
^ Heater core
^ Heater hoses
Engine coolant provides freeze protection, boil protection, cooling efficiency and corrosion protection to the engine and cooling components. In order to obtain these protections, the engine coolant must be maintained at the correct concentration and fluid level in the degas bottle.
When adding engine coolant, use a 50/50 mixture of engine coolant and distilled water.
To maintain the integrity of the coolant and the cooling system:
^ CAUTION: With the engine cold, fill vehicles to within the cold fill range shown on the degas bottle. This fill level will allow for coolant expansion. Overfilling the degas bottle may result in damage to the pressure cap, which can cause the engine to overheat.
Add Motorcraft Premium Gold Engine Coolant with Bittering Agent or equivalent (yellow color). Do not mix coolant types.
^ Do not add/mix orange-colored Motorcraft Specialty Orange Engine Coolant with Bittering Agent (US) Motorcraft Extended Life Engine Coolant (Canada); or equivalent. Mixing coolants may degrade the coolant's corrosion protection.
^ Do not add alcohol, methanol, brine or any engine coolants mixed with alcohol or methanol antifreeze. These can cause engine damage from overheating or freezing.
^ Do not mix with recycled coolant. Use of such coolants may harm the engine and cooling system components. Do not mix coolant types.
Coolant Flow Diagram, 5.4L 3V:
Coolant Flow Diagram, 6.8L 3V:
Coolant Flow Diagram, 6.4L Diesel:
