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mav1178 - Um, but I did. @
Capt Spaulding - It doesn't get constantly replaced, we already know that. You don't need to keep beating the semantics of the thread title. I already mentioned replenished in the description.
If the entire cooling system was closed, then "topping off" would never be a phenomenon, but it is because the coolant reservoir vents to outside air, but nobody here has mentioned that, so it IS getting replenished
here and there, but rarely necessary. My question was about the dynamics of fluid exchange primarily, no sure why no one could understand that here except for the community on stackexchange.