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ah, i had to do this a few years back. its a little tricky. first you have out the fan cover. then take off the fan. you will need a 3/4 wrench socket i think. you might have to double check. next you need to spray wd-40 or some other lubricating oil on the belt. it should be easily acessible since the fan is no longer in the way. if you need to move that radiator by hand a little that's fine, but make sure not not to slide off any of the fluid lines. since you now have the belt lubricated start turning it little by little and it should eventually slide off. if you have any more questions about it just ask!

Added: See this link. It shows how to replace both the main serpentine belt and the A/C belt.

http://www.bmw330ci.net/maintenance/belts.php

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