Your car's AC is blowing warm air. The most common first step is a recharge — refilling the system with refrigerant so it can start cooling again. But before you pay for one, there's something most people don't realize: your car's AC system is completely sealed. Refrigerant doesn't get "used up" during normal operation. If the system is low on refrigerant, it's because something is leaking. A recharge without addressing the leak is a temporary fix — you're refilling a system