Sheep - you may have air trapped in the cooling system and it's expanding and forcing coolant into the overflow.
There is a bleed valve located under the plastic cover below the oil filler / coolant filler caps. Open the D ring to its vertical position and run the engine for at least 3 or 4 heat cycles (or maybe a few days) of normal driving. This will expel any air locked in the system. Top up the coolant as required with the correct mix ratio.
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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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