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More precisely it is a coolant drain hose that drains any overflow from the pocket around the coolant fill and vent relief in the trunk. If you spill coolant while filling or coolant is released through the fill cap it is drained by this hose. If you detect a coolant release from this hose it is likely your coolant cap is bad or you are making more than 20 psi in the coolant system because of over heating. The cap will release pressure over 20 psi.
You need to pressure test the coolant system and make sure it is full. This drain hose is a symptom not a cause of a leak.
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2003 Boxster S with 2008 400+HP L92 with VVT delete, Comp Cam Thumpr, LS3 intake, 42# injectors, Corvette gas pedal and throttlebody, LS7 lifters, double valve springs, heavy push rods, rocker trunnion upgrade. 2009 corvette MAP. 2009 corvette computer.
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