Check the water pump, a likely culprit, I've had two go bad with your exact symptom. In addition, your tank might be cracked and leaking through the trunk, check for under the carpets. Make sure your coolant cap's product number ends in 01 or better. The fan will run if needed, even after the car is turned off.
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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
Last edited by tboyer; 07-17-2008 at 06:57 PM.
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