Cars and trucks with internal combustion engines burning gasoline, diesel and natural gas fuels use coolants. Liquid circulating around the engine absorbs heat created by combustion, then carries it away from the engine where it cools as it passes through a radiator. Automotive coolants are generally made of three key components: water, glycol and an additive or chemical inhibitor package. While a coolant can be made of a liquid, or other substance depending upon the application, let’s focus on those used in engines by the automotive industry, since they’re probably the most common – or at least the ones people are most familiar with. With this perception of complexity comes a laundry list of questions: “What’s the difference between a red coolant and a green coolant? What will happen if I mix the two? Is ethylene glycol the same as propylene glycol?” In this article we’ll try to answer these and other questions by breaking things down into bite-size chunks that are easy to understand. But in a market of ever-increasing technologies, OEM requirements, and even colors, the products can seem quite complex. They provide freeze and boil protection and they prevent corrosion. A coolant, or “antifreeze”, as referred to by the vast majority of consumers, serves a couple of relatively simple purposes in automotive and industrial applications.
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