Once the coolant leaks out of the tank it moves all around the truck as you drive the car. Ever hear of "centrifugal force"? Liquids will slosh around as you drive....trust that it will always find a place to leak out of since the car isn't sealed "water tight".
Replace your old, yellowed plastic coolant expansion tank AND BE DONE!
(of course while you're at it I suggest you change out your water pump and buy an OEM replacement tank....not a cheaper aftermarket substitute .....you usually get what you pay for these days.
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98' Boxster
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