Vent windows were once a common feature in cars, especially in the 1950s and ’60s. They were small, triangular windows located at the front of the car’s main windows. Vent windows could be opened to let in fresh air while driving without having to roll down the entire window. They were especially popular before the advent of air conditioning, as they provided a way to cool off on hot days. Some drivers even used them to smoke while driving as they helped ventilate the car (via Car & Driver).
However, with the widespread adoption of air conditioning in cars, vent windows have become less common. Many modern cars don’t even have them as an option. This is because air conditioning systems are much more efficient at cooling down a car’s interior than vent windows. Additionally, cars today are designed with aerodynamics in mind, and vent windows can disrupt the flow of air over the car, leading to increased drag and reduced fuel efficiency. Despite this, vent windows are still fondly remembered by many car enthusiasts as a nostalgic feature of classic cars.