Remove the water pump and see if you can flush the system backwards to see if any broken impeller parts have collected in a point that might be able to be dislodged and removed.
Not an expert -- but I have heard of blade parts breaking off and blocking passages in the heads which lead to hot spots and ultimately cracked heads.
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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