Could be the cap is not sealing. I cross threaded mine and got the same behavior.
Luckily I was able to just unscrew, add water and put back on.
I had to run with the bleed valve open for a bit to burp the lines.
Mike
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Drivers: '15 Panamera Hybrid (wife's), ' 01 996 GT2, 00 Boxster S, '96 993 Çab/Tip (wife's)
Race Cars: '75 911 RSR Replica & '99 Spec Boxster
mike@lonestarrpm.com
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