origin of coolant leak from D60??

[luckyron1]

We have a slow coolant leak that I first noted after getting a low
coolant warning upon start-up. I topped off the reservoir with the
appropriate diesel 50/50 mix and it did go away, at least for about 700
miles or so. So, I added some more 50/50 and ran the engine for about
an hour and checked it all around and underneath and no leaking at
all. So, I shut it off, slipped a piece of clean cardboard beneath the
block and this morning I noted a little puddle of coolant on the
cardboard at the left forward part of the block, which is the radiator
side on this bird--when viewed from the rear of the coach. It does
appear to be coming from behing the block, away from the radiator. I
know from looking at a basic D60 engine that the water pump isn't back
there. Hoses?? Any ideas???

Thanks

Ron & Ruth in 2000 LXI