How to Deal with Rust in the Radiator?

2 Answers
DelBlakely
07/29/25 11:44pm
Here are the methods to deal with rust in the radiator: 1. For newly manufactured cars: Newly manufactured cars come with antifreeze added at the factory, and there is no air inside the radiator, so there is no rust in the car radiator. 2. If there is water in the radiator: Even if water is added to the radiator, there should be no rust because the oxidation of iron requires oxygen. When the radiator is full of water, there is no air, hence no oxidation. 3. If cold water is added to the radiator: Over time, scale (calcium carbonate) may form in the radiator when cold water is added. This can react chemically with acid and be removed, so it is necessary to soak it with more vinegar. Since a brush cannot be used inside the radiator, a longer soaking time is required. 4. If there is a small amount of rust in the radiator: If there is indeed a small amount of rust in the radiator, it can also be soaked in vinegar and then rinsed. The main component of rust is iron oxide (Fe2O3), which reacts chemically with vinegar to remove the rust.
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StClaire
08/16/25 3:01am
Last time my old Jetta's radiator got rusty, it took me a long time to fix it. First, check how severe the rust is. If there's only a thin layer of rust spots on the inner walls, buy a radiator cleaner, pour it in, let the engine idle for 20 minutes, and then rinse it thoroughly. Never take shortcuts by just adding water, as the rust will only get worse. If the rust is deep or even causing leaks, then you'll have to replace the radiator. Afterward, always use dedicated antifreeze—it prevents both freezing and rust. I check the coolant color every month; if it turns rusty red, it's a sign of rust. I recommend a thorough radiator cleaning every two years—it's much cheaper than repairing an engine.
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