yes, the flange is plastic. no, the coolant didn't cause the leak. the fact the VW used plastic on for a part that sits on a hot metal engine and has boiling coolant/water flowing through it ... THAT's what causes the flange to deform (mine was visibly warped). imho. the new, metal replacement flange is thicker, but does NOT have a hole cut into it for the o-ring. so you'll have to use a flat type of gasket. joel
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