S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

Aux cooling fan is staying on :s430

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Old 02-06-2010, 08:22 PM
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Aux cooling fan is staying on :s430

I have a 2000 s430. The aux cooling fan is staying on after the car is off,draining the battery. Could this be a module or fuse problem? Where to locate them? This started after the rain. Thanks for any help.
Old 02-06-2010, 09:31 PM
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Which one is the fan relay?
Old 02-06-2010, 09:39 PM
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2012 CLS63 AMG Performace - Obsidian Black
Try the fuse links first-

33 and 48. Here's a diagram...

http://www.benzworld.org/forums/w220...e-diagram.html

...good luck
Old 02-07-2010, 05:07 AM
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Where is the aux fan control unit located?
Old 02-08-2010, 11:08 PM
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Can anyone help?
Old 02-14-2010, 12:18 PM
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I took the fan control unit off & took it apart. There was water & some corrosion. I cleaned it up & put it back. But still the same problem. Could it still be a damaged fan control unit? Should I replace that first?
Old 02-14-2010, 06:39 PM
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Mercedes
you can wire up an on/off toggle switch and turn it on/off manually

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Old 02-22-2010, 11:54 PM
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Problem solved. I got a new fan control unit off ebay for $100.00 & that fixed it.
Old 05-31-2011, 04:57 PM
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w210 e55
was it the same or similar part number?

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