No easy answer... Here's some of my saga:
http://www.peachparts.com/shopforum/diesel-discussion/304961-its-heater-season-acc-fun.html
I finally got mine working well but it took a lot of work and some $$. I believe if your amps are crapping out the problem is most likely the servo. Probably the water valve portion unless the gear train/servo motor part got wet and corroded.
You won't get any feet heat with the 116. Heat is routed to the outside vents and the door panels when max heat is on.