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50/50 coolant to distilled water is the mix.
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Technically, 65-70% antifreeze is the best for both freeze and boil protection. Above 70%, heat transfer and other problems arise. 50/50 is just easier.
But again ... first step is to fully clean out the radiator screen & fins. This might be the only problem, and since its free, should be your first step
Ditto.
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