[wa-fu]

I have a 97 with about 82,000 miles on it. My a/c recently quit blowing cold air. The blower works fine but the air is not cold. A couple days ago it was really cold but now it's not. When the car is idling, I hit the a/c button, it lights up and the rpm increases. The pully on the compressor starts spining too. Any ideas? Thanks.