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

How soon do you get in your car before making a run? I’m slow and only need a helmet, pants, jacket and 5 pt harness. I usually get in my car with 2-3 pairs to run in front of me. I don’t crank my driver side window up until I start to pull into the burnout box. My track moves cars at a decent pace so I usually don’t have to be fully strapped in my car long.