Thunderchiken

Ok, here's my problem.
My 93 3.8 has had A/C problems from the day I got it. I replaced every component including the liquid line that ran me about 900 bucks and I supposedly got a deal on it. It worked for about 6 months and just died, so I replaced the compressor with a brand new one ,as advised, and still nothing. Recently I attemped to get it fixed but after putting freon in it, it blows cold for a few minutes and gradually heats up. When I shut the car off I can hear the freon coming out of the compressor. Keep in mind that I am a college student and money is a big issue for me, so if anybody could help me out with this it would be greatly appreciated. Thanks, Josh