One thing I've thought about is dash cooling. Run waterlines right under the dash and then up to a radiator with a fan, but could be powered by a small solar panel. It just seems to me that the dash is one of the main places that heat gets into the car (roof can be white or covered in aluminum foil or chrome or something like that). You could have a reflective dash, but that would be hard to see as it would reflect onto the windshield. Hence, why adding cooling to the dash makes sense to me, that way less heat will get into the car.
__________________
|