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Old 01-06-2013, 01:02 PM
pcy pcy is offline
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Location: Boston
Join Date: Sep 2011
Posts: 2,059
Mein Auto: '06 530i, '07 C280, ML320
Based on the info you've provided, I'd say one of the pullies is not perfectly straight (damaged/not installed correctly) or one of the pullies is seizing (like compressor pulley).
Spin each pulley by hand and see if you can identify the culprit pulley.
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