The 6.7L Power Stroke® diesel engine has two separate cooling systems. The engine cooling system, called the primary or high temperature cooling system and the powertrain secondary cooling system, a low temperature system which cools the Charge Air Cooler (CAC), fuel cooler, EGR cooler and transmission oil cooler. Both cooling systems have their own radiator, belt-driven coolant pump, thermostats and degas bottle. Motorcraft® Specialty Orange coolant mixed with distilled water is the only coolant to use in the 6.7L Power Stroke® diesel engine.
