What are the reasons for different colors of antifreeze?
2 Answers
Antifreeze comes in different colors to distinguish it from other liquids. Ethylene glycol-based antifreeze is green, propylene glycol-based antifreeze is orange, and diethylene glycol-based antifreeze is blue. The colors are achieved through the addition of dyes, primarily to facilitate the identification of leaks and prevent accidental ingestion. The various colors result from dyes added to the main component, ethylene glycol. The full name of antifreeze is antifreeze coolant, meaning it is a coolant with antifreeze properties. It prevents the coolant from freezing in cold winter conditions, which could cause the radiator to crack or the engine cylinder block or head to freeze and become damaged. Antifreeze is mainly used in liquid-cooled engine cooling systems and offers excellent performance in preventing freezing in winter, boiling in summer, and protecting against scale and corrosion throughout the year.
As an experienced driver who has been behind the wheel for many years, I believe the different colors of antifreeze primarily serve to help us quickly identify types and prevent mixing. Green represents traditional ethylene glycol antifreeze, which has a shorter lifespan and is suitable for older vehicles; red, on the other hand, is long-lasting with more advanced components, making it ideal for newer models. Random mixing can trigger chemical reactions, leading to radiator corrosion or pipe blockages, which can be costly to repair. I've seen a friend mix red and green, resulting in engine overheating and failure. The color also indicates aging—if it fades or becomes cloudy, it's time for a replacement, allowing for proactive maintenance to avoid trouble. Every season change, I make it a habit to check the color against the vehicle manual, a simple yet effective way to protect the engine. In summary, the color isn't just a visual marker—it's a safety reminder, so don't underestimate its importance.
