Nearly all engine coolants are based on water, an excellent heat transfer medium. Similarly, coolant in hybrids and electric vehicles improves battery life and manages electric motor-generator temperatures. Engine coolant’s sole purpose is heat transfer, balancing overall engine temperature and removing excess through the radiator. Too much heat leads to destructive detonation, engine oil breakdown and lubrication failure. Some heat is good, as it improves fuel vaporization and efficiency. The rest of the fuel’s chemical energy is lost as heat. If you’re wondering, “Why do you need engine coolant, as opposed to water? What is engine coolant made of? How do you know when coolant is worn out?” don’t worry, because we’ll answer all of those questions and more.Įven in the most efficient internal combustion engines, little of the explosive energy of the fuel is converted to motive power to get you down the road. Engine coolant isn’t always easy to judge by appearances alone. Looking under the hood, though, it can be difficult to tell when to change coolant. Knowing when to change coolant, engine oil, transmission fluid and brake fluid, among other adjustments, will help you get the most out of your vehicle. Regular maintenance is key to engine performance, efficiency, reliability and longevity.
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