![]() Generally, the coolant system should be flushed and changed at least every 50,000 miles. Need a coolant designed for high-mileage cars, one that’s formulated for specific manufacturers or one with specialized additives. As with all other fluids that an engine requires to provide reliable service, coolant or antifreeze needs to be maintained and changed based on the manufacturer’s recommendations. How Often Should You Change Engine Coolant? Choosing the wrong product can result in poor performance or engine failure. HOAT is a popular coolant used in a majority of new vehicles.Īlways refer to the manufacturer’s specifications in the owner’s manual of your vehicle to verify what type of coolant your vehicle requires. Hybrid organic acid technology (HOAT) coolant is a hybrid of IAT and OAT coolants. They are available in several different colors, ranging from dark green and orange, to pink and blue. There are several brands of organic acid technology (OAT) coolant. This coolant can come in eitherĪ green or yellow color. This type of coolant needs to be changed more frequently because it tends to lose its qualities faster. ![]() Inorganic acid technology (IAT) coolant is the conventional coolant that was used on older vehicles for many years. Three types of coolant are routinely used to service vehicles cooling systems. That protects your engine from cracking and experiencing increased pressure. It won’t freeze and expand in hyper-cool temperatures like water would. Coolant also provides resistance to freezing. The resulting corrosion interferes with heat transfer even before the build-up plugs the radiator and fills the coolingĬoolant helps reduce corrosion and engine rust. The rust is then carried off to other cooling areas. Pure water has more heat-carrying ability than pure ethylene glycol, so water would be the best coolant to use if the only consideration in the selection of coolant was its ability to carry off heat.īut water presents other challenges. The major difference between the two types is that propylene glycol is less toxic. Common coolants consist of a mixture of ethylene glycol with additive packages and some water.Īnother glycol-based coolant consists of propylene glycol and water. What is Car Coolant Made Of?Īll automotive coolants are glycol-based. The coolant is then returned to the top of the radiator where it’s cooled again. The engine’s block and head, where it absorbs the excess heat to control the engine temperature. It’s then drawn into the water pump, which pumps it into Coolant exits from the bottom of the radiator after it’s cooled. ![]() When the engine’s running, the coolant continuously circulates through the engine and back through the radiator. The thermostat controls the temperature of the coolant. ![]()
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