The path that you are taking sounds like it is a last resort, and we don't know if you have done any other diagnostics, like checking the accumulator/dryer. What are the symptoms, and what have you checked so far?
I had problems with my AC that was was able to chase to the AC clutch itself. I lifted the front of the car, took off the right front wheel, the fender liner, and I could see the AC clutch. I whacked it with somethign while the a/c was turned on, and it started to run. I bought a new clutch at the dealer, and had it installed in no time.