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Originally Posted by Duke2.6
Way back in the fifties, if not before, some thought that running pure distilled water in a cooling systems was good, but without corrosion inhibitors, distilled water will rapidly corrode the system. Once the word got out, somehow this advice got turned into "don't use distilled water with antifreeze", which is wrong!
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That is right. In fact, running tap water alone in your cooling system will also cause it to corrode. The mixture of the coolant and the water provides the balance of lowering the freezing point, raising the boiling point, and inhibiting corrosion.
Most makes now recommend distilled water, and why not? It's cheap and plentiful.