Question about 2000 Mercedes-Benz S-Class

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I have a 1994 s320 after switching of the engine the two similer looking fans in the hood continue to spin and dont stop unless i remove a battrey terminal

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You first need to scan the computer for any stored codes, these codes will help in pin pointing the problem, if there are no codes then i would take a look at the fan relays and then coolant fan sensor and coolant temp sensor, this sounds like the cooling fan sensor is bad, also one more thing is that the relay is like a module and they do good bad often, hope this helps.

Posted on Sep 13, 2010

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Posted on Jan 02, 2017

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I have a 2002 Jetta diesel and the fan won't shut off for about 5to10 min after turning ignition off, any suggestions?


You haven't got too much to worry about.

There's a module under the hood that controls the fan. It may look like what you see in the link below.

http://d3nevzfk7ii3be.cloudfront.net/igi/XbD1JcNwbHgRnN4b.standard

If you can locate the module, try tapping it. If the fan switches off the module is at fault.

The other thing you can do is just to remove the relevant fuse when you stop the car. The fan will stop. Replace the fuse and you're ready for the next trip..

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Hi, Can you tell us how you found out the fans aren't working?
It operates only when car is running and engine is hot. 

:)

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Radator cooling fans not coming on as relates to air conditioning 1999 s320 mercedes


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It is controlled by the Coolant Temperature Sensor. it is located on the engine by the thermostat housing. It is brass colored with a small plug going to the fans.
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the cooling fans are run by a relay it's located in the junction box. check this. there is also a thermoatic sensor located near the fans next to radiator. the fans should free spin when the engine is off this is a good indiacator that it's not the fan themselves. if the relay checks out(run engine and switch the fan relay with the a/c clutch relay when the engine reaches 180 degrees you will feel the upper radiator hose get hot the fans will turn on a short time later iof they don't it's the temp sensor near the radiator if they do it's a bad relay...please rate this thanks

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