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My guess is that the cracked head is a low probability scenario for the same reason you cite.
I recently had my coolant tank replaced is it took a couple of weeks for the system to flush out all the bubbles before the coolant level stabilized. During that time I worried constantly that fluid was disappearing into a cylinder through a crack.
BTW: let me ask the obvious. Are you 100% sure the bleed valve is closed.
Last edited by thom4782; 04-11-2016 at 04:09 PM.
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