Drivers finally realising what bended arrow button in car is for

Modern cars have so many different features and buttons it can sometimes be hard to know what they all do. One such button features a curved arrow, almost reaching a full circle, inside an outline of a car. Its purpose is certainly not immediately evident and one online guide claims "99% of people get it wrong". Threads on social media see drivers asking " What is this button in my car?" and "When should I use it?". One said: " It has to do with AC, I know that, and the car gets colder when I press it, but I don't know what it's called." Thankfully, there are just as many people online explaining what the button is for and when and why you should use it. There are also times it won't work, which you'll also find explained here. The button in question is the air re-circulation button. It is linked to your car's air conditioning. If you turn it on, you are instructing your car's air conditioning system to recirculate the air already inside your car, as opposed to drawing in new air from outside to heat or cool down. It is particularly useful, for example, if you want to avoid some form of polluting influence outside like smoke from a fire, dust from a construction site or pollution from cars if you are in a traffic jam or a tunnel. It is also useful on particularly hot days — if you turn it on your car will recirculate the cooler air already inside your car instead of continuously pulling in warmer air from outside and working harder to cool it down. The Capturing Cars YouTube account , which has 10,500 subscribers, claims "99% of people use this button all wrong" and explains how to use it: "It is a recirculation button. Essentially, it shuts off the vents to the outside of the car, trapping the air that's in it. So, when should you use it? On a very hot day, or very cold day, that is when you will first want to use this button. "Let's assume it's really hot outside so you've turned your air conditioning to cold... what you will want to do is press this button. That will then trap the air inside the car and it will get colder on each pass, or hotter if you've got the heating turned on. "If you don't have it turned on you are bringing in boiling hot air from outside and trying to make it cold and it takes a bit longer. Turning that button on will accelerate the process of cooling down the car." Another driver explained: "Speaking from personal experience, I drive by a rock quarry every day on my way to work and I make sure the recirculation button is turned on because I do not want my car sucking in all that dirty outside air and pumping it into the cab." The Capturing Cars YouTube account explains: "Let's say you're in the car, you've got wet clothing because you've been caught out in the rain — if your car is fogging up, which, let's face it, we've all experienced, that is when you'll want to turn this off [because] you are trapping humidity inside the car." In fact, he went on to explain that if you turned your air flow to focus on the windscreen to de-fog it, the air recirculation button would automatically no longer work. Scrap merchants Ace Car Breakers add that you may not want to have it on for long periods of time. They said: "It’s important not to rely on it all the time. As us humans breathe in oxygen and breath out carbon dioxide, it’s crucial that we let the fresh air in too – fresh air is vital for preventing the air inside from becoming stale and ensuring there’s adequate oxygen levels and the CO2 is vented. You should therefore make a point of switching back to fresh air mode regularly."