There are two pumps side by side on the reservoir, and the second one might have a broken nipple. It is very well possible that some one has plugged the second pump so the water will not leak. I know since I have done the same

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87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)