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Old coolant begins to break down merely because of the conditions within the engine, being heated and cooling down all of the time. And it can become polluted with dirt and rust particles. Eventually this causes damage to the inside of the engine and radiator, it can clog passages causing the engine to overheat, and cause the engine block and radiator to rust badly from the inside out.

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Q: What can happen if coolant doesn't get changed?
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