The 6.7L Power Stroke® diesel engine has two separate cooling systems:
• The engine cooling system, called the primary or high temperature cooling system,
• 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. Corrosion resistance needs to be checked at specific intervals using Motorcraft® test strip kit. Consult the workshop manual for details.
