Hardy-har-har, Zerohour.

Seriously, I bought this car used just last month, so I don't know if anyone tried to recharge the system before. I tried to get some fresh refridgerant into the system, but I'm not sure how much actually went in. After all, 25-45psi is a charged system according to the guage. It's still just blowing hot air. I was wondering if it was the compressor not catching for some reason. Can that be fixed, or does the whole compressor have to be replaced?