Why Does Coolant Change Color?
2 Answers
Coolant changes color due to the following reasons: 1. Prolonged use of coolant leading to oxidation reactions; 2. Contamination by other liquids; 3. Deterioration or presence of impurities in the coolant. Coolants are colored, with different colors representing different compositions. Common coolants include ethylene glycol, propylene glycol, and glycerol, and they are located in the engine compartment. The functions of coolant are: 1. Preventing the cooling liquid from freezing in cold weather, which could cause the radiator to burst or damage the engine cylinder block or head; 2. Effectively preventing boiling at high temperatures to avoid overheating; 3. Providing anti-corrosion protection.
It's quite common for antifreeze to change color, and I'll explain why this happens. The main reasons are aging or contamination of the antifreeze. Antifreeze contains certain additives, such as rust inhibitors and anti-corrosion components, but over time, these can break down and become ineffective, causing the liquid to darken or become cloudy. Another possibility is the intrusion of contaminants into the cooling system, such as oil, dust, or rust particles, which can make the fluid appear less clear. Mixing antifreeze from different brands can also cause chemical reactions that lead to discoloration. Once the antifreeze changes color, its cooling efficiency decreases, making the engine prone to overheating, which could result in a breakdown while driving. Ignoring this seemingly minor issue can, over time, damage the radiator and water pump, leading to more expensive repairs. I recommend changing the antifreeze every two years and keeping the cap on to prevent contamination. This will help maintain its clarity and ensure your car runs smoothly and fuel-efficiently.
