Just purchase a window divider from a member on here name Ratrod. Living in south FL with summer around 100 degree, it takes a while for the car to cool down after parking in the hot sun. This window divider definitely helps cool down the car quicker. It also works great when sharing the ac vent with a passenger. I'm not affiliated with the seller and paid full price for my window. I did not receive a discount or have anything to gain with my review. I am just posting to help any members that may live in hot climate as I do. The fit, finish and customer service is excellent. Here is more info and seller description below.
"I have a 97 GTS and had suffered many hot summers too! I designed and built a 'cabin divider' window that press fits behind the seats and the headliner. It separates the driver cabin air from the trunk air. This effectively doubles the efficiency of your A/C system. It works great for me! I made a bunch of them for my buddies. I'm selling them for $55. If anybody is interested, just email me [email protected] or call 248-574-9166. Ask for Roy."