If thats your problem, that means you have a leak somewhere and most of your refrigerant (R-134a) has probably leaked out. You need to find a reliable A/C shop (this can be tricky), and have them find the leak and repair it, and then recharge the system for you. Unfortunately A/C work tends to be kind of hard on your wallet, but if you find a place that does it right, then you won't have to worry about it for a while. Good luck.
