I experienced the same problem, in my case BOTH the expansion tank was cracked and the water pump was bad. Open the trunk and pull back the carpet, look for the "river" Suggest you purchase replacement parts from Suncoast (including the 99610644703 coolant tank cap), click here for their direct link and have an experienced shop install....the dealer will knock you over somewhere in the area of $900 for tank replacement and $1000 for the water pump. Good luck!
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'06 Cayman 'S' - Sold (Sport Chrono, PASM, TPMS, 19' CAS Wheels, NAV)
'06 Cayenne - Sold
'01 Boxster 'S' - Sold
'00 Boxster - Sold
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