Does anyone know the part number or a source for the rubber hoses that run to and from the auxiliary water pump? One is almost a straight hose, so I could probably just buy a foot or so of bulk hose, but the other one is flared out at the end where it connects to the engine.

It looks like the '81-'84 part is: Heater Hose 1238329194 - Genuine Mercedes-Benz - 123-832-91-94 | Pelican Parts Does anyone know if that will work on the '85 model? I have no idea what's different between '84 and '85 that would call for a different hose.

I'm replacing all of the other water hoses on the car, so it would be nice to replace those while I've got the system drained.

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'85 300D - federal spec, built in late 84. 85 300D Complete AC System Rebuild

MY85 shows A 123 832 50 93.
Don't know what the difference is between the 2 hoses.
The straight hose looks to be A 123 832 49 93.

EDIT: Apparently the above hoses are for the California MY85 however the EPC does not indicate that.

85 CA is probably different because of routing around the frame-mounted air filter, but I would think 85 federal would be the same as 82-84. If you get stuck, 5/8"D silicone heater hose works fine. It is flexible enough to slip over the larger nipple (I used). While doing that, you might toss that silly electric "aux water pump" since you don't need it to get plenty of heat and it can:
1) draw enough current to melt your push-button box and start a dash fire (needs a fuse).
2) lose coolant thru shaft seal so your engine overheats and gets destroyed (if not watching gage)
3) stop turning and block flow to the heater core
Maybe those in the far north can realize a slight benefit from it.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

Here is a list I've compiled.
http://www.peachparts.com/shopforum/diesel-discussion/380182-w123-coolant-heater-hoses.html#post3627964

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1983 123.133 California
- GreaseCar Veg System

Confirmed that my 85 has part 1238329194. Not sure why thats not listed for 85..

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'85 300D - federal spec, built in late 84. 85 300D Complete AC System Rebuild