Quote:
Originally Posted by pbonsalb
My theory on the cap is excess pressure from expansion due to either heat or overfilling it. It can vent all over the place or just dribble out the channel and down the side and then travel in it along the seam. Reports are that the seam itself has leaked in some cases.
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Agreed. Makes me reluctant to install a stronger aluminum tank because then some other plastic coolant system component may start leaking elsewhere.