Aux fan and clutch fan - Page 2 - Mercedes-Benz Forum
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post #11 of 30 (permalink) Old 06-03-2013, 09:48 AM
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Darryl -

Looking at the circuit diagram for your car, the clutch fan is primarily controlled by a 100C temp switch, which should be the two prongs on the 3-prong black switch above the blue switch in your picture. If you jumper those two connectors, it should engage the clutch.

The blue switch feeds a control unit that then activates the auxiliary fan when necessary to assist in cooling. Both fans should also be triggered by the a/c high pressure switch when the a/c is engaged.

You may find this thread helpful.

(PIC) which wire is the coolant temp sender? - 190 Revolution
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post #12 of 30 (permalink) Old 06-03-2013, 06:02 PM Thread Starter
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So I jumped (shorted) the 2 posts on the 3 post sender and the fan did nothing but blow the fuse. So am I to assume that the magnet is shot or is there a relay or something to check?

Thanks for the link, it helped loads.
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post #13 of 30 (permalink) Old 06-04-2013, 06:23 AM
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There might be an actual wiring short, I'd inspect the wiring going to the fan clutch and the wiring going to the relays for the e-fan, and the e-fan wiring.


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post #14 of 30 (permalink) Old 06-04-2013, 06:39 AM
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I agree, it is likely a short.

Note that the fan clutch is triggered directly by this switch, not via a relay (except when it is triggered, along with the e-fan, by the a/c pressure switch). Use a meter and check for shorts to ground on the wires triggering the clutch.
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post #15 of 30 (permalink) Old 06-04-2013, 09:18 AM Thread Starter
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I considered putting in a larger fuse for a few minutes to see if the clutch will engage at all. Any concerns or suggestions?
Darryl
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post #16 of 30 (permalink) Old 06-04-2013, 09:22 AM Thread Starter
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considering that the fuse has never blown before this event I would safely say that the sensor switch is bad.
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post #17 of 30 (permalink) Old 06-04-2013, 09:29 AM Thread Starter
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OK I watched closely and the fan starts to turn and then the fuse blows.
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post #18 of 30 (permalink) Old 06-04-2013, 09:31 AM
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Not a great idea to put a bigger fuse in there.

Does your A/C work? If so, both fans should engage when you turn it on. You can also jumper the leads at the A/C pressure switch which should trigger the fan clutch and the aux fan (assuming the relay in the circuit functions).

Also, if you are doing this without the engine running (but ignition on) make sure to watch the actual gap at the fan clutch to see if it moves.
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post #19 of 30 (permalink) Old 06-04-2013, 09:36 AM
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Originally Posted by Darryl Elkins View Post
OK I watched closely and the fan starts to turn and then the fuse blows.
Time to check for a short.
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post #20 of 30 (permalink) Old 06-04-2013, 09:38 AM Thread Starter
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I was doing this test with the engine running so I can watch the fan itself. The a/c needs a charge which is scheduled for Thursday. Curious about the electric fan and the sensor switch it uses so I may replace the fuse and move the clutch fan plug to the a/c plug and see what happens. I know that the electric fan works because it has come on a couple times when idling.
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