Engine Cooling

The cooling system components are the:

• block heater (if equipped).
• radiator.
• bypass tube.
• turbocharger coolant tubes.
• pressure relief cap.
• degas bottle.
• radiator draincock.
• coolant pump.
• thermostat (cold side).
• variable speed fan motor assembly.
• engine block coolant weep hole.

Courtesy of FORD MOTOR COMPANY

The coolant pump is located under the engine front cover mounted to the block. A weep hole is provided on the front left side of the engine behind the generator, adjacent to a 13.5 mm (0.531 in) cup plug. The plug and the weep hole create a reservoir for normal coolant seepage and evaporation. Every coolant pump will have some leakage past the dynamic mechanical seal. Dampness and crusting around the weep hole is acceptable and an expected result of normal engine operation. Address any coolant spray or leakage amounts large enough to puddle.

Engine coolant provides freeze protection, boil protection, cooling efficiency and corrosion protection to the engine and cooling components. In order to obtain these protections, maintain the engine coolant at the correct concentration and fluid level in the degas bottle.

When adding or topping off the engine coolant:

• measure the coolant concentration in the vehicle using Coolant/Battery Refractometer 300-ROB75240 or equivalent.
• determine the concentration desired based on the vehicle duty cycle of extreme hot or cold operating conditions.
• add/top off or adjust the coolant as follows:

  • 1.
    
    for concentrations measured 48/52 to 50/50 (equates to a freeze point between -34°C (-30°F) and -37°C (-34°F)), use Motorcraft® Orange Antifreeze/Coolant Prediluted to maintain a coolant concentration in this same range.

  • 2.
    
    for all other concentrations, use Motorcraft® Orange Antifreeze/Coolant Concentrated and/or distilled water to get to the desired concentration. Refer to Cooling System Draining, Filling and Bleeding .

When refilling the engine coolant after a flush procedure, use a mixture of Motorcraft® Orange Antifreeze/Coolant Concentrated and distilled water to get to the desired concentration.

To maintain the integrity of the coolant and the cooling system:

• add Motorcraft® Orange Antifreeze/Coolant or equivalent. Do not mix coolant types.
• do not add or mix with any other type of engine coolant Mixing coolants may degrade the coolant's corrosion protection.
• do not add alcohol, methanol or 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® Orange Antifreeze/Coolant since a Ford-approved recycling process is not yet available.

Coolant Flow Diagrams 

3.7L Ti-VCT 

Courtesy of FORD MOTOR COMPANY

3.5L GTDI 

Courtesy of FORD MOTOR COMPANY