try rotating the compressor pressure plate, if its locked solid then you need to redo the entire system as it probably shot debris in it. If its still able to rotate then you have a chance of lower cost repair and a few options.

you can either rebuild the compressor with new seals and a magnet coil or simply swap it out for a new one and a reciever drier with hose.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)