Whenever I write about recharging your AC system, an inevitable flow of commentary follows. The discussion centers on the question of whether an AC system should ever be recharged by a car owner, and why recharging is a pointless exercise and a waste of money. I'll save the "only the pros can properly evacuate and vacuum load the AC system" subtopic for another day, and instead focus on the "if your AC refrigerant is low, you have a leak, so anything you put in is going to leak out, too" angle. It's true that in a perfect world your AC would never need to be recharged. But think of a car which is 10 years old. If it has even a pinhole leak, that's enough to deplete the system over a period of a decade! You can recharge the system and get another 10 years out of it, or you can take the advice of the naysayers and start replacing AC hoses, seals and other components until you (or your mechanic) are convinced the leak is fixed. I like to approach auto repair from a point of basic economics and take the route that makes the most sense to my wallet. Make your own decision, but if I had warm air blowing from my AC vents, I would recharge my AC and not think twice about it.