I feel your pain. Same thing happened to me. Evidently there were either a batch of fans wired incorrectly or there was a running change during a model year and the parts manufacturers decided to combine the part numbers without giving explanation that you have to reverse the plug

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Dennis
2006 E320 CDI Black/Black Leather. Nav, HTD Seats HK stereo 32000 miles.
2000 VW Passat 1.8t 300,000 miles as of Dec 09, 2009 original owner
1997 E300d Silver 300,000 miles As of Jan 05, 2010
3rd owner SOLD