What is the difference between antifreeze colors?
2 Answers
Antifreeze comes in three colors. The main components of antifreeze are ethylene glycol, propylene glycol, and diethylene glycol. Ethylene glycol is generally green, propylene glycol is red with a hint of orange, and diethylene glycol is blue. The primary function of antifreeze is to protect the engine and ensure its normal and efficient operation. It circulates within the engine radiator, providing anti-freeze, anti-boil, anti-rust, and anti-corrosion effects. Antifreeze is colored red or green to make it easier to detect leaks or to distinguish it from other engine fluids, preventing confusion. Below are some precautions for using antifreeze: 1. Choose antifreeze according to the specific requirements of your vehicle. Imported vehicles, domestically produced vehicles, and mid-to-high-end vehicles should use permanent antifreeze (lasting 2-3 years). 2. Select antifreeze based on the number and concentration of vehicles. For units or departments with a large number of vehicles that are relatively concentrated, opt for small-packaged antifreeze concentrate, which is easier to transport and store. 3. Choose antifreeze with rust-proof, anti-corrosion, and descaling capabilities. The most critical aspect of antifreeze is its anti-corrosion properties. Opt for reputable brand products, as they contain additives like corrosion inhibitors, rust inhibitors, scale inhibitors, and cleaning agents, ensuring product quality.
I've seen too many troubles caused by wrong coolant colors in repair shops. Honestly, the color itself doesn't indicate the formula - red, blue, green, yellow are mainly for manufacturers' identification. The key is to check the ingredient type labeled on the bottle: ethylene glycol or propylene glycol, Organic Acid Technology (OAT) or Hybrid Organic Acid Technology (HOAT). Mixing different colors can cause serious problems - I've personally seen red and blue coolant mix turn into a paste-like jelly that clogged radiator pipes. It's best to open the hood and check the original color, then buy the same factory color. If unsure, consult the manual. Remember to completely replace it every 2 years or 40,000 km, otherwise the anti-corrosion effect weakens and the water pump/radiator can rust and fail.
