![]() ![]() ![]() There’s basically coolant from the nose to the end of the sleeper. When a coolant is needed to suit multiple OEMs, typically a full OAT coolant is recommended, as this satisfies the performance requirements of most OEMs.Coolant systems are notorious for causing leaks, because the coolant fluid travels to a lot of different places – the after-treatment system, the heating system, and the engine.Ĭoolant actually runs all the way to the back of your cab. This has led to the proliferation of many different hybrid types, each specifically designed for particular OEMs. Some OEMs recommend the use of specific hybrids in their cooling systems while forbidding the use of others. NOAT, POAT,SOAT coolants are all examples of hybrids, respectively referring to nitrited organic acid technology, phosphated organic acid technology, and silicated organic acid technology. Hybrid technology is a mixture of conventional and organic acid technologies, with the inorganic inhibitors added for extra protection of known cooling system weaknesses. Once the natural protective oxide layer of the aluminum is restored, inhibitors can be returned to their original form and are reused 1. How it works: Organic acids are triggered by pH changes in the corrosive process to move to trouble spots in the system and create a hydrophobic precipitate layer 2 to protect from corrosion. However, many heavy duty OEMs are moving to a nitrite-free version because the increased heat that the coolant has to withstand in modern heavy duty engines can cause rapid consumption of nitrite. Heavy duty variants will contain nitrite and or molybdate for cavitation corrosion protection. Also, this technology is the best coolant for protecting the aluminum of modern engines. ![]() This technology may cost more for the initial fill, but maintenance costs are dramatically reduced. Organic Acid Technology is the technology used as factory fill in most American original equipment manufacturers (OEMs),including light and heavy duty makes. However, the inhibitors are used up when they rebuild the film, which results in a need to maintain the coolant more frequently 1. How it works: Inhibitors react with metallic ions on the surface of the metal to form and continuously repair an insoluble protective film throughout the system 2, thus protecting the metal against corrosion. This technology is popular with some users because it is familiar and cheap however maintenance costs can be pricey in the long run, and if a rigorous maintenance schedule is not followed, engine damage can occur. The oldest, original coolant technology is called conventional or inorganic technology. Since these technologies have different maintenance requirements, a failure to understand the type of coolant technology in one’s cooling system could cause damage. One of the main differences between the types of antifreeze that must be understood is the difference between conventional, organic acid, and hybrid technology coolants.While color may be the most apparent coolant characteristic,the chemical additives within the coolant, called inhibitors, are what provide the protection needed for the cooling system metals. These inhibitors form a film over the metal protecting it from the effects of cavitation corrosion. The ONLY way to protect a heavy duty engine from pitting cavitation is to use and maintain coolant with proper heavy duty additives,such as molybdate and nitrite.
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