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Definitely sounds like an air pocket - try lifting the D ring on the expansion valve & leave open for 2-3 days (several heat cycles) and see if the coolant drops even further. Top up as required....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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