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Check your overflow line from under the radiator cap to the expansion tank. On my westerbeke it is a fitting just beneath the fill neck where the pressure cap goes on. Mine was clogged, so removed the fitting and used a small drill bit to open the small hole behind the fitting into the filler neck. That took a while to figure out. One other place I developed a leak was the engine coolant pump. It was pretty subtle and the pump didn't make any noise. The dye sounds like a good idea. Murphy's law is that the leak is on the inaccessible side
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