Aux cooling fan is staying on :s430 - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 02-07-2010, 11:56 AM Thread Starter
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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 fan control unit or relay problem? Where do I locate them? This started after the rain. Thanks for any help.
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post #2 of 3 (permalink) Old 02-08-2010, 08:05 PM Thread Starter
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Can anyone help?
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post #3 of 3 (permalink) Old 02-09-2010, 06:35 AM
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According to the WIS, I have identified this fault on another model, but it could be your reason also. For W208 (after 1997) with 113 engine.

Fault: Auxillary fan runs when engine is off.
Cause: "Water ingress in the fuse/relay box, via the housing cover, causes corrosion at the contact between the fuse and relay module, front passenger relay box (SRB) and the SAM."

So I would examine this area for any signs of corrosion, as it would seem that the cover is not totally waterproof. Here's a picture of the parts involved.

1. Clamping lever. 2. Fuse carrier. 3. Couplings. F1/1 Right fuse box. K40/7 Right front fuse & relay module. N10/7 Passenger side SAM control module.
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Last edited by keyhole; 02-09-2010 at 11:52 AM.
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