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I will add to the comments above and if you have a leak, and you do, you can also reduce the effectiveness of the cooling system because it may not pressurize properly. Apart from finding the leak, I would also pressure test the cap.
Contrary to what was posted above, pure water does a better job of rejecting heat versus coolant. You do need the coolant though, because of the higher freezing point of water, and anti-corrosion and lubricating properties of some of the additives in the coolant.
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