mu 2001 boxster overheats if i leave the pressure release lever in the normal position. i have cleaned the 2 front heat exchangers, checked the water pump impellers, and the thermostat and replaced the coolant tank cap. i have to keep the pressure release lever up so it won't overheat but it sweats from the coolant pressure - please give me some insight on why it overheats when it is pressurized - thanks
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Pelican Porsche Tech Article - Coolant Tank Replacement - Porsche 911 Carrera - Porsche 996 Carrera (1998-2005), Porsche 997 Carrera (2005-2008)