Question about 2000 Mercedes-Benz S-Class

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My s430 collant fan won't turn off . i have replaced the fan switch & thermistat.

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This happened to me once. If the connector to the coolant sensor is off the fan is automatically on. When I checked the the thermal sensor resistance I had it open. After replacing with a new one and there was a resistance, I plugged the connector in and the fan was still on. I opened the connector to see the wire broke off from the solder point to the metal plug, then it just like the connector off. After I re-soldered and snapped back the connector, it worked as normal.

Posted on Oct 04, 2009

  • tony moore Sep 21, 2014

    on the S class mercedes passenger side headlight behind the headlight is a veritable Fan speed control it is a silver box with a big plug going to it if the fans stay on and will not cut off normally that is the problem also replace fan relay



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