Folks, I have a slight coolant leak from the aux water/heater pump located in the battery bay of my 95 E300D. I do not want to part with $375 for a new one. It looks like an easy bypass job (run some hose). Are there any issues with this bypass? Anyone done it? Thanks

I have the same car, and had a similar problem, consequently I have become somewhat of an expert on this. In my case the brown plastic housing [the one that holds the auxiliary water pump and mono-valve] was slightly cracked, and allowed drops of antifreeze to escape. I put epoxy on that and it stopped the leak.

However I also discovered that my auxiliary water pump was not working. I disassembled it, cleaned it, and temporarily got it working again. Since however the brushes were worn out, I finally replaced the whole assembly at the cost that you mentioned.

I am not clear however as to where your leak is. If it is the actual auxiliary water pump, you can try to LIGHTLY tighten the three screws that hold it down. Alternatively, disassemble it and examine the "O" ring. Perhaps you can put some gasket sealant around it and then put it back.

Let me know exactly where the leak is and perhaps I can better advise you.


Phil

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'95 E300 Diesel, 264,000 Miles. [Sold it]