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

Although not race car related, I can speak to the cooling vest. Nella wears one at horseback riding, because she also wears a neoprene vest for trunk support, and gloves to protect her hands, and she get very hot in that outfit. We freeze her cooking vest and put it in a cooler and I put it on her right before riding. It lasts her about 20 minutes before it gets back to body temp, so that’s about 1/2 her ride time. It’s not the best scenario, but without it, she would not make it 20 minutes. So, it does extend your comfort time, and maybe enough for you to finish your run and not be overheated.