heater problem

[Robert & Teri Rahn]

We just completed a 3000 mile trip in our bus and nothing broke or went
wrong the whole way. It was such an awsome trip. So I have decided to
try to fix a situation that has existed since we have had this bus.
There are three heat exchangers in the coach plus the heat from the
dash. Also I just installed the new domestic water heater that has
connections for the engine coolant that I hooked up. Bothe of the rear
heaters work and get really hot, the one under the front sofa blows
almos cold air, the dash blows cold air, and finally the water heater
doesnt have hot water after driving the bus all day.

When I replaced the water heater last week I noticed that in the inlet
for the engine coolant there was a waxy substance that seemed to be
clogging the line at the copper elbow. I cleaned it out and replaced it.

Any ideas on where to start?

I checked at the engine and found three red handle valves and they all
seem to be open

Robert Rahn
88 pt 40
Warner Robins, Ga.