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Every time an aluminum core radiator is involved there is every likelihood of loss of cooling capacity from internal corrosion of the tubes. If tap water has ever been introduced into the radiator, that point was the beginning of the end for the radiator. Just like a battery nothing other but distilled water should ever be placed into an aluminum core radiator. 50/50 coolant premix contains distilled water (at least it is supposed to).
I'd check the radiator's present capacity verses what capacity is supposed to be. Even a quart difference is sufficient to present overheating problems with some engines at less than highway speeds.
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