The relief valve that you use to burp the system can sometimes get tired. There are o-rings under it that might be worn and I had one that actually split in half at the track with the coolant pouring out of the overflow hose causing a spin! End of my event, obviously.
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James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow! 
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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