Im roasting in my car, ideas to cool it down.

I've considered taking a 5 gallon bucket and cutting a 3" or so hole in the side of it and dropping a block of ice in it. Then making a lid that my Milwaukee 18v fan will fix to and have it blow straight down into the bucket hopefully exchanging enough heat to cool the car before a pass. No idea if I can get it to work. Might be more trouble than it's worth but I'll give it a go. I've also thought about keeping my helmet in the fridge between rounds. Kinda goofy and it would render the lense worthless but might be nice when it's 120 in the car.