Your post helped me rethink my current portable ice AC.
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I used the "instructables" website for building one for myself.�Can't say I've had 100% success with it yet, but it has saved me a few times. �I use it for work. I need to redo my fan, it doesn't pull air through the unit as much as I'd like, so I'm going to change it to push air through.
You need a cooler, heater core, bilge pump, fan, tubing and a free supply of ice.
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If there is a bright side, it is I am getting used to 95+ degrees and high humidity. 
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Chris 3
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AC in a non AC vanagon

wondering what people think about this unit:

http://www.sportys.com/PilotShop/product/16540/

My '81 Vanagon Westy doesn't have AC and to put one in, would take hp
away from the engine......