It not that I'm a Cheep A$$ but really.... Well maybe I am

The Vave is what $11.00 (http://www.rustrepair.com/STEPVAN_PARTS/onlinecat.htm?r=fr&p=WI-HEATER-HT.VAL)

Cable from Auto Zone $6.95

And how hard is it to add new heater hose at 50 cents a foot with a few hose clamps.

Just need to add a cable to to contol the flaps (dampers) to push air to the defrosters and or vents and floor.

Switch to supply 12V to both curulation pump and blower motor when turned on and another runs the AC compressor.