EDIT: Mods delete please, I made one in the tech section...

OK heres the deal... I'm not sure if any of these are separate problems or not but Ill throw it all in. I want to get this fixed but I'm in collage right now and dont have alot of money to waste on this. I need to know if a shop could fix this or if its possible for me to try any recommendations from you guys.

1. The a/c only blows medium cold air. I have tried to release some pressure and recharge back to about 45-50 psi so I think the freon level is ok. But Im not sure exactly since every once in a while one side will blow hot and the other cold, which seems to be a indication that's its also low.

2. The system does not seem to be leaking. I tried to fill the freon up last year to deal with this and the PSI hasn't dropped since then, so therefor no leak right?

3. The system will just randomly stop blowing cool air and just start to blow hot. Currently I have a switch for the a/c, so when the cold stops blowing, I reset it while driving and It will blow ok again, but maybe after 5 min it will start to blow hot again.

4. The climate control seems to "lag" a bit. For instance, if I turn the ac on and turn the level up a few times it wont go up. If I wait 5 seconds and hit the button it will instantly blow at the desired level.

Please help, this problem is really making me want to trade this in for a BMW, which I'm really trying to avoid. (I still love the C5 too much!)