It appears that there are 2 separate fan motors You can go to Fastlane link above under ordering parts and see if that is the case. You should be able to test and see if both are getting power.

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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