![]() Historically in North America, conventional engine coolants have been green in color. While these other ingredients make up only a small fraction of the coolant, they are what differentiate one coolant from another. In addition to the base fluid, there are a small amount of other ingredients including corrosion inhibitors, antifoams, dyes and other additives. In some circumstances, industrial engines may use other base fluids, such as additized water or a mixture of propylene glycol and water. Nearly all engines use coolants with similar base fluids: a 50/50 mix of ethylene glycol and water. The addition of glycol slightly reduces the heat transfer of the water, but in most climates and applications, freeze protection is critical. While water provides the best heat transfer, glycol is also used in engine coolants to provide freeze protection. ![]() ![]() Overheating could result in accelerated deterioration of the oil and the engine itself. This heat removed by the coolant provides a balance in the removal of engine heat that is critical in ensuring that the engine operates properly. The remaining one-third of heat energy produced is taken away by the engine coolant. An additional one-third is removed as heat energy by the exhaust system. In a heavy-duty diesel engine, only one-third of the total energy produced works to propel the vehicle forward. It plays a critical role in sustaining engine heat balance by removing heat. Coolant (or antifreeze) protects your engine from freezing while defending components against corrosion.
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