[instarx]

I doubt it is possible to cool the inside of a car using Peltier units.

If your goal is to keep the driver from suffering heat stroke in the summer Virginia heat, some frozen ice packs inside his clothes would be good. There are commercial "cool vests" available that use this technique to cool people working in hot environments, but you could make your own using a fishing vest.

I would look at a small electric pump to periodically inject a very fine water mist into the car. Evaporating water sucks huge amounts of heat out of the air and can be an effective people cooler. Your driver would be cooled by the cooler air produced and/or by some cool mist in the face. I even remember seeing an infomercial about a small battery-powered mister that fit around the user's neck.