The noise from the A/C compressor is most likely the pulley bearings. The pulley can be replaced (I did it on mine) and not have to replace the compressor. If your lucky you can replace the actual bearing and use that pulley or just replace the pulley as a single unit.

Read through my post here: https://xoutpost.com/bmw-sav-forums/...pair-help.html

You can see the options that you can use.

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'01 740i Sport MKIV, Quad Brake Lights, Bi-Xenon retrofit, HID Fogs Dinan 7 Struts, Springs, camber plates, Intake, MAF, CAI, Throttle Body, NBT Retrofit, Strong Strut


'99 318ti Titanium Silver; '97 318ti Boston Green; '13 X5 3.5i Saphire Black Metallic
'84 633csi Black (sold); '88 325iC Black (sold); '97 740iL Black(sold); '01 740iS Black (sold);'97 318ti White (sold); '08 X5 4.8i Titanium Silver (sold); '96 318ti Alaska Blue (sold)