Does anything else have to be changed when doing a ac compressor swap on a 2005 bmw 745li

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This all depends on if the compressor came apart and sent debris throughout the entire system. If so, either the system will need to be flushed out or all of the components will need to be replaced. The next issue is your car has R12 refrigerant in it and this has to be retrofit to the replacement R134. This is a special kit to retrofit the fittings, O-rings, and other components of your vehicle.

For the compressor that is seized, you will at the very least need to replace the compressor assembly and clutch, receiver drier, expansion valve, and flush out the system. I recommend having a mechanic diagnose your vehicle to see if any other components need replaced in order to fix your air conditioner.

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