Aquahot leaking under coach

[Gary&Terry]

I noticed that my Aquahot is leaking under the coach. Initial evaluation is that it is coolant. It is not diesel fuel based on the feel and smell. Today I will try to look underneath to see where it's coming out. I realize that will not mean much because it may be flowing from somewhere else to wherever it is coming out. I checked my overflow tank and it is empty I just filled it up from empty two ago I guess that should have been cause for alarm. Anyone have good ideas on where to start looking. If there are no simple ideas, this may be a big enough problem that I need to take it someplace rather than tear the whole thing apart myself. Full timers don't have the option of a nicely equipped garage and the flexibility of timing on this kind of thing.

So, what do you guys think?

Gary