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IMA Tech - the major source of heat is from the air and through the windshield. On some days, I'm uncomfortable even outside the car.
Carlos - Target has those for $1, and big ones for $2. Cheap and very easy.
Daox, that looks like a useful material. But I'm not familiar with it, and I'd really hate to spring a leak on the road due to poor workmanship. You'd also have to make several seals inside the material so as to define a flow path throughout it.
The chilled seat idea has merit, but I really don't plan to use this more than two months out of the year. I'm leaning towards a chilled seat cover. There's nothing to entangle you as you move around in the car, there's plenty of contact with your back which would otherwise be swampy, and it leaves your chest still exposed to cooling air from the fan and open windows (if need be).
I checked out a few materials at the pet store, and I think thin vinyl tubing is the way to go. It's cheap, and the smaller stuff has a good bend radius. I guess I need to go to the fabric store and find something I can stitch tubing into, then throw it over the headrest and... I dunno, velcro it in place?
I'm not excited about the washer pump. Any ideas where I can find a cheap inline 12V pump rated for continuous operation?
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