DIY Air Conditioner - Now this is cool.....'-)
Flash back to the early '70's. Bought a Fiat. ( no idea why) Had front wheel drive with the spare tire on top of the engine. One day i was at the dealer and he wanted to show me something on the car. Carlo had the spare off the engine and there was what looked like a large plastic box under where the tire rested. Asked why it was there. Carlo, originally from Italy said: you know there cars don't have air conditioning. So in Italy the air from inside the car circulates through this box. In Italy they put a block of ice in it and it cools the inside of the car!!
(Yes, one of the worst cars I ever had!!)