[les korcala]

Well, our A- Hot is working great so far, after replacement of both elements.
I learned some good stuff about the more powerfull element ( 4000 wats ) that one only works wjile diesel swith is on!
When Art ( cerified AH ) replaced the new coolant ( 19 gallone of 50/50water ) we used portable pump to pump the coolant in to the tank.
This tank I learned it has barrel wrapped around with some 170' of bras tuubing where coolant stays hot and heats the tank.
We noticed that zone 1 ( living area of teh coach & also the largest ) would not let us to get any coolant in?

After several times, finally we were able to flush the old coolant out of the zone 1 line , it was cloged up with some particles and very dark old looking coolant! I still dont know how that zone did work with cloged up line?

All zones now firing up good, I monitored for several days for any leaks and the tank level and all looks good.
Wewbasto silver box ( control brain ) was making clicking noise ( it has bunch of realys inside ) Art was so kind , he would let us swap his " test brain box " for few days and he took ours and test it on his coach!
Its showed that we dont have any clicking and our box in he's coach tested with out any clicking !

I wander if perhaps is websto burner where the clicking noise comes from!

Anyway, heat is on, hot water is one & want to thanks everyone for their input!

Best,
Les