I've been considering trying to convert what's left of Homer's dealer installed air conditioning into an evaporative cooler. I've got two condensors under the bus and the evaporator inside the cab (mounted up on the roof right behind the front seats. All the hoses are still in place. About the only thing missing is the compressor.
So, here's what I'm contemplating: Close up the system by looping the hoses that went to the compressor together, filling the system with water and installing a small pump to make the water flow. Then all I would have to do is cool the water . . . well as I am moving down the road, if I spray water on the condensor, the wind would evaporate it, cooling the condensor. The cool water would then flow to the evaporator where the fan would blow across the coils, transfering the heat inside the bus to the water in the system that would then travel to the condensor under the bus where water evaporating from the outside of the condensor would cool it down again. To make it cool even better, I could pipe the water going back to the evaporator through a cooler full of ice water in the seat of the rear facing chair behind the driver's seat (early bay Westy interior).
What'cha think?