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Antifreeze coolant is a heat-transfer fluid used in internal combustion engines and other cooling systems to regulate operating temperature, prevent freezing in cold weather, and inhibit corrosion. Modern formulations are primarily based on ethylene glycol (EG) or propylene glycol (PG), mixed with water and a carefully balanced package of additives. The glycol component lowers the freezing point and raises the boiling point of the mixture, while the additive package performs critical functions: corrosion inhibitors protect metals (like aluminum, cast iron, and solder) in the cooling system, buffers maintain the proper pH (typically alkaline), anti-foam agents prevent cavitation, and scale inhibitors prevent mineral deposits. The mixture ratio of concentrate to water—commonly 50:50 for all-season use—determines the exact freeze and boil-over protection levels.

The primary application is in automotive engines, where it circulates through the radiator and engine block. However, it is also used in heavy-duty diesel engines, industrial cooling systems, HVAC chillers, and solar water heaters. A critical distinction is made between conventional (inorganic additive technology or IAT) coolants, which use silicates and phosphates, and extended-life (organic acid technology or OAT) coolants, which use organic acids for longer service intervals and better compatibility with modern aluminum engines. Using the correct type as specified by the vehicle manufacturer is essential to prevent damage. While effective, the toxicity of ethylene glycol (harmful if ingested) has increased the market share of less-toxic propylene glycol-based coolants, especially in applications where leakage is a concern. As a vital maintenance fluid, antifreeze coolant ensures engine efficiency, prevents catastrophic overheating, and extends the lifespan of the entire cooling system.