Had issues with the water pumps since a cambelt change two years ago. Didnt help that the head gasket went but this was solved with a new one and a head skim before refitting. The problem is that the water pump keeps leaking at on the side of the block. Its had 4 replacements in the two years since the cambelt...one at cambelt, one under warranty of water pump due to leak. Then diagnosed as head gasket, then another since head due to still leaking. I'm wondering if the pump mating is damaged on the block??? I'm now also dubious that the head was even an issue as there were no issues of mayo in the filler neck, but extreme coolant loss around the block from the flange.
Any ideas before I take it back in?