Cooling System: Description and Operation

Engine Cooling

CAUTION: Vehicle cooling systems are filled with Motorcraft Premium Gold Engine Coolant VC 7 A (in California and Oregon VC 7 B, in Canada, VC 7 C) or equivalent meeting Ford specification WSS M97B51 A1 (yellow color). Always fill the cooling system with the same coolant that is present in the system. Do not mix coolant types.

The cooling system components include the following:
^ Block heater (optional)
^ Cylinder head temperature sensor
^ Fan blade, fan motor and fan shroud assembly
^ Radiator
^ Pressure relief cap
^ Degas bottle
^ Radiator draincock
^ Coolant pump
^ Oil cooler (optional)
^ Thermostat

The thermostat:
^ controls the engine coolant temperature.
^ allows quicker engine warm up.

The degas bottle:
^ provides a location for system fill.
^ contains coolant expansion and system pressurization.
^ provides air separation during operation.
^ replenishes the engine coolant to the system.

The fan blade draws air through the radiator to help cool the engine coolant.
The fan motor:
^ operates only when the engine is running.

The engine coolant flows:
^ from the lower radiator hose to the coolant pump.
^ from the coolant pump to the engine block and the cylinder heads.

A closed thermostat returns the engine coolant to the coolant pump. An open thermostat allows the engine coolant to flow to the radiator.
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 clean, distilled water.
To maintain the integrity of the cooling system:
^ Add Motorcraft Premium Gold Engine Coolant VC 7 A (in California and Oregon VC 7 B, in Canada, VC 7 C) or equivalent meeting Ford specification WSS 97B51 A1 (yellow color). Do not mix coolant types.
^ Do not add/mix Motorcraft Specialty Orange Engine Coolant VC 2 or equivalent meeting Ford specification WSS M97B44 D (orange color). Mixing coolants can degrade the coolants 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.
^ Ford Motor Company does NOT recommend the use of recycled engine coolant in vehicles originally equipped with Motorcraft Premium Gold Engine Coolant since a Ford approved recycling process is not yet available.

The cylinder head temperature sensor provides a signal to the temperature gauge and will invoke fail safe cooling.
The optional block heater:
^ electrical heating element is installed in the block cooling jacket.
- uses a standard 110V (220V in Europe) electrical supply.

^ keeps the engine coolant warm during cold weather.

The auxiliary coolant pump (3.9L only):
^ provides heater coolant flow boost.
^ has a secondary function of providing engine off cooling.








Coolant Flow 3.0L








Coolant Flow 3.9L