I assume the rear blower motor still works that would help circulate the front A/C around the Van, and if there's any roof ducting for it that's a plus! I'm in Michigan and like having the rear heater on for longer trips, no sweaty feet.........lol

 

I looked for photos of my 88 ClubWagon, dual heat/AC factory. This is the best one I could find: red arrow is one of the heater lines, hose and hard line. The green stuff is HI/LO AC lines, also hose and hard line with Quick Connects. Ignore the blue stuff, fuel selector lines.

The conversion van folks use a variety of parts, the back to back Rotalock valves may have just been the fastest way to connect up the lines with the parts at hand. A call to a local RV repair shop might provide information or options on getting the leak fixed?
jim



Heater lines red arrow
AC lines green arrow
ignore the blue stuff, front/rear fuel tank selector