Surface temperatures in the car can reach over 65 degrees Celsius in a short period of time. Cracking the window doesn't help that, keeping the vehicle in the shade does. I would definitely remove the backglass if it's not a translite, and cover the pin with a light colored sheet or blanket to help protect the plastics some from potential warping. I would also not bring the pin into an air conditioned space immediately if possibly. Rapid temperature change is what can cause warping.