1999 BMW 328 Air blowing out of the A/C

I have a 1999 BMW 328i and it has developed A/C problems. The A/C worked fine every year up until the spring of 2010. I went to turn it on and all it did was blow air at me. Not cold air though just air about the temperature of the outside. It's as if the A/C was just taking the air from the outside and blowing it into the car. I would not want to take this to a repair shop because I know it'll be costly so is there and easy fix for this.