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I recently noticed coolant leaking out from mid-section of our DL3-45.  The coolant is of the color and consistency of our DD60 engine coolant.  The Aqua Hot coolant is the bright green color.  Initially I had nightmare visions of a coolant leak from the wiring chase in the floor - on the way to the driver dash defroster/heater. No bueno.  But the more I checked that became less likely. Immediately above the coolant leak is the Aqua Hot, and the leak is dropping off the exterior of the exhaust elbow.  In the bay housing the Aqua Hot, I see absolutely no moisture above the Aqua Hot.  And the tray beneath the AH unit is a bit gummy, but that could just be due to the fact it needs a cleaning?  I'm not sure there.  It doesn't get gummy again if I wipe it down. 

The leak is about 1 drop every 15-30 seconds or so, coming off the Aqua Hot exhaust pipe. 

The Aqua Hot has 3 zones.  Two work perfectly.  Front floor heaters, Rear floor heaters.  And our hot water component of the Aqua Hot also works - usually.  It is serviced regularly. 

I have zone questions.  Could the 3rd zone be the engine pre-heat?  I do have an engine pre-heat button for the Aqua Hot, but I've never been able to get that fixed - it's never worked for me.  Or find anyone who would do that service work - yet.    That could explain the leaking engine coolant vs the aqua hot coolant, which is the wrong color for the leak.  Maybe?

Phil - confused in Arizona
Thank your for any insights!

The DL came with a diesel fired heat for the engine the converter could have removed Espar and tied into the Aqua Hot ,you should have valves on the engine to shut that zone off, converters cut corners and will use a rubber hose tied to a piece of cooper and it causes leaks, I chased a leak like before on a Custom Coach MCI conversion

Yes, our coach does have the diesel fired heat for the engine.  It's jammed up in the engine bay, pretty much impossible to service.  I think it's a Webasto. So am I looking to find valves on the engine which are connected to a rubber hose / copper tubing such that I can shut that off, and hence stop the leak?  Right now it looks like the Aqua Hot itself is leaking, but it's hard for me to determine.

Thank you Clifford!