Did you do a thorough job of checking for external seepage that might have been boiling off without leaving any drips? Usually there is a odor that results from this situation but maybe it wasn't easily noticed.
I hate to say this, but if you're losing that much coolant without any drips or smell, then its most likely going out the tailpipe...
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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