heated tanks

[nostradumass]

I have a 95 Sunsport, and it has heated holding tanks, can anyone tell me how they operate? I cant find any kind of switch to turn them on anywhere in the coach, or by the tanks, do they operate when the furnace is on?? Thanks Bill

[Arthur Hayes]

Look for a short piece of duct coming into the tank area from the furnace. This supplies warm air to that area.

[nostradumass]

I did locate it and thanks for the reply, it was cut flush with the coach floor and looked like just a hole in the floor.
I extended it around three inches and all is well , thanks Bill