Clever Car Interior Hacks You Wish You Knew Sooner! As the summer heat wave hits, many of us are looking for ways to keep our car cool without cranking up the air conditioning. Some of us might be grilling in the driveway, while others are driving around with the windows down. But what about the inside of your car? If you're looking for ways to keep your car cool and comfortable this summer, here are 30+ clever car interior hacks you wish you knew sooner!