These engines have plastic impelers on water pump which fails / breaks and therefore coolant doesn,t flow - and engine overheats . If all else looks ok ( no leaks in system, head gasket checked and ok, radiator not blocked ) this could be the issue - If water not flowing into overflow bottle with engine running & hot coolant not being pump through radiator therefor no cooling affect . You will have to get a new one from VW and they are change over type replacement part - makes you think VW are aware of this issue and would rather it was kept quite ?
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