The hidden chemistry behind your car's multi-colored engine coolant
In short: Engine coolant comes in a spectrum of colors, but the hue isn't just an aesthetic choice. This video explores the industrial history and chemical engineering that dictate why different formulations exist and what happens when they clash.
The variety of colors—including green, orange, red, blue, pink, and yellow—serves as a visual indicator for specific coolant technologies such as IAT (Inorganic Additive Technology), OAT (Organic Acid Technology), and HOAT (Hybrid Organic Acid Technology). While the dyes help mechanics identify leaks, the color itself does not determine the fluid's quality or performance.
Mixing incompatible coolants can lead to chemical reactions that damage modern engines. Because different formulations are designed for specific engine requirements, manufacturers use distinct colors to prevent cross-contamination and ensure owners use the correct chemistry for their specific vehicle.
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Sources
- Summary by Intellect · source: Why Is Car Coolant GREEN, RED, BLUE, or PINK?
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