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Interesting thread. There are only two possibilities in a closed system, a leak or coolant escaping through the combustion chamber. Judging by what the experienced engine builders are saying about the FA I don't think its the latter. By leak I don't necessarily mean a drip that can be seen. With older coolants there was typically some white chalky residue visible around the leak. With modern coolants it's harder to detect. I'd start with the cap and move on to the hoses if it continues. Its not normal no matter what anyone's says. In the old days the system would sometimes vent, often overboard. But these are modern closed systems, closed being the key word.
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