You helped me out with some suggestions on my 2013 WX a while back and I've got another one for you. Did you ever solve the problem with the coach not staying warm while driving in cold weather? On our cross country from Florida to Vegas and back, it stayed cold as hell in the cabin even with the aqua hot going if ambient temps were below 45F. I've taking some steps to mitigate (installing adhesive insulation layers to inside of fiberglass front end cap; wrapping heat tubes in front end cap with insulation tape, etc). Has anything worked for you?
ALSO, is your aqua hot heat exchanger under the coach connected to the vent or does it just sit bolted to the floor of the coach like mine? I had to fabricate a duct so the heat goes directly out of the coach vent instead of just venting into the empty area under the coach.