You can do it all from above. Takes about 45 minutes. Remove fan/shroud, remove airbox and intske pipe up to the rubber elbow, unbolt power steering res and move it to the side, undo belt, undo two alt bracket bolts, rear wire retaining nut, unclip wiring harness on back of alt, then pull it up and out in between engine and coolant res.

Easy peasy. Don't forget to disconnect the battery.

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03 3.0i mt
89 325is