Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
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I had a work van that started out as a 15 pass van with rear heat and A/C, which I mostly removed to install shelving. I left the heater core and A/C unit behind the shelves because I didn't want to deal with the Freon and coolant lines, but removed all the ducting and fan motors...
It did have dual fan speed switches on the dash, one front and one rear... both on the dash in the factory location.
I would recomend using hard pipe, not rubber lines, for the longer sections from front to rear for the coolant, and just use rubber where the flexibility is needed. You'll get less expantion under pressure, and less likelyhood of a burst hose. I don't remember how the lines hooked up under the hood, but I would guess you could 't' into the lines going to the front heater core, but might want to install something to force equal flow to each, otherwise you'll have good flow to the front one (shorter tubeing, less resistance) and not so much to the rear, as it's farther away. I would try a ball valve in each feed line, at the 't', and partially open/close each to adjust flow... crude, but it would work, you'd have to adjust them untill it works right. My guess is one will end up all the way open, and the other slightly closed, you'll just have to figure it out.
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