As Tony pointed out the tanks do crack from age/heat exposure.
Poor thing lives above the left muffler.
In addition the tank cap has the pressure relief in it. The valve can fail. Check the cap to be sure that it is tight and look at the overflow trough around it for evidence of crusty pink dried antifreeze.
Someone could have overfilled the tank before you picked it up. Typically the level should be near the "min" mark when the engine is cold and just below the "max" when hot if filled correctly.
Here is one of many threads/videos etc... addressing replacement.
https://rennlist.com/forums/997-forum/850639-help-997-1s-coolant-expansion-tank-replacement.html
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
Last edited by FPB111; 05-29-2017 at 01:21 PM..
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