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Old 03-19-2008, 10:00 PM
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Join Date: Jan 2005
Location: St. Louis Missouri
Posts: 473
95 E320 aux fan craziness

About a month ago, I replaced a defective aux fan with a new one manufactured by ACM of Germany. (part number 000 500 8593) After completing the work, I jumpered the freon pressure switch to verify operation. Both fans started spinning--I was happy with another maintenance item completed.

A few days ago, I noticed running temperature a little higher than what I would expect. I suspected it might be time for a viscous fan clutch. So, to diagnose the problem, I let the car run for a while to warm things up. As expected, both aux fans came on at about 110 C. In order to get things just a slight bit warmer (to check the viscous fan clutch) I put a piece of newspaper in front of the grill. Instead of sucking the paper to the grill, the fan I installed a month ago blew the paper back at me. I checked about ten times, and sure enough, the fan was running in the wrong direction. I looked closely at the directional arrows on the black plastic bullet shaped part of the fan and they confirmed that the fan was indeed running in the wrong direction.

I stood there for a while and scratched my head. I remember from installing the fan that the plug could only be installed one way. It was simply not possible to reverse polarity. A quick search of this forum revealed that this is not the first time this has happened.

I removed the fan, disassembled the black plastic plug, swapped the pins around, reassembled the plug, (no cut and solder required) and reinstalled the fan. It now runs in the direction indicated by the arrows.

Go figure.......

J. M. van Swaay

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Old 03-20-2008, 08:20 AM
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Join Date: Nov 2005
Location: Cross Roads, PA
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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
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  #3  
Old 03-20-2008, 11:32 AM
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'94 S500: only 793 sold!
 
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Location: San Diego, CA
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Quote:
Originally Posted by J. M. van Swaay View Post
I removed the fan, disassembled the black plastic plug, swapped the pins around, reassembled the plug, (no cut and solder required) and reinstalled the fan. It now runs in the direction indicated by the arrows.

J. M. van Swaay
Yes, that's been reported a few times!

Let us know about the VFC's clutch 'shaving' and if it works for you.

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