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Just an idea, but since methanol is more volatile than water, could it be evaporating somewhere
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Volitility is an interesting question.
While methanol is more volatile then water, it also is a larger molecule then water. So it comes down to which is more important to the rate of coolant loss- how much pressure the coolant vapor exerts against your seals or how fast the coolant will effuse between the microscopic gaps between the tube and barbs.