AC system

What is your question?

The front of my S60 T5 2004 was damaged recently. Replaced the radiator, knowing the condenser was bad too ( couldn't afford a repair ). Obviously, the ac isn't working, and finally have the money to buy a new condenser. How do I know if I need a new compressor too? Oh, the fan runs all the time it's on too. Is that a bad relay, or somehow trained into the compressor? I've read about a clutch, but haven't got a clue??? I by no means what to do a disservice to anyone who is a trained professional, by trying to repair it myself, I just can't afford it. Any help would really be appreciated. Thanks