W126 aux fan not working - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 06-12-2013, 03:30 PM Thread Starter
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Date registered: Jan 2012
Vehicle: 1970 Mercedes 220D
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W126 aux fan not working

Hello. I am having an issue with the aux fan on a 1987 300SDL. I checked the fuse and the fan does not come on when the ac is turned on and also when the engine passes 100 degrees. Is there any relay I need to check or replace?
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post #2 of 2 (permalink) Old 06-13-2013, 07:00 PM
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Totally different car but replacing my 100 C single wire switch for about $25 fixed my fan problems. Of course I made sure my wiring harness looked intact and made sure the fan spun with 12 volts applied directly to it.

When done, I had to put cardboard in front of the radiator to make the car go above 100 C to get fan to turn on.


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Last edited by Fonzi; 06-13-2013 at 07:02 PM.
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