You can’t be olde skool without an original thermador car cooler. Basically its air-conditioning that uses no energy. Inside the big gray tube is a blanket with a string attached that hangs in the passenger window. You fill the tube up with water before you start driving, then every so often you pull the cord. It rotates the blanket inside and dips it in the water. Then air comes through the tube, it becomes cool by going through the wet blanket and finally goes into your car. Obviously it doesn’t work in high humidity or when you’re at a stoplight. Expect to pay as much as $275, but I got lucky and found mine on eBay for only $130.