You don't include any info about the model or year, please fill us in.

On my 87 300D I get a low coolant level warning light before the resevoir gets empty. Mine is leaking around/at the aux coolant pump. Right now I am feeding it and watching it.

And looking for another aux coolant pump. Anyone have a spare????

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.