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In Reply to: Aux. coolant pump posted by Bridge 1990 735iL on February 24, 2002 at 15:31:54:
Bridge, i recently replaced my heater valve 88 735i and noticed that my aux coolant pump had corrosion which suggested that my aux coolant pump is leaking. I replace the heat valve due to intermittent heat loss and I had hoped my leak would be cured as well but my leak source is the aux. coolant pump. I have noticed small spots for about a month. After looking at the pump I would guess that it shouldn't burst open but just leak slightly. i don't know if anyone has tried to reseal the pump. I suppose i will change it when I have the time. mike