R170 SLK 230 fan switch has ceased working !! - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 1 Day Ago
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R170 SLK 230 fan switch has ceased working !!

Hi all. Well as the heading implies the fan has stopped working and presumably everything on the car related to Heating,Air Conditioning,cooling in the cabin has also ceased.

Any ideas please and is it something that is an easy DIY fix ?
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#2 Old 1 Day Ago
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Originally Posted by ARoosterinaRoadster View Post
Hi all. Well as the heading implies the fan has stopped working and presumably everything on the car related to Heating,Air Conditioning,cooling in the cabin has also ceased.

Any ideas please and is it something that is an easy DIY fix ?

Hi, If you have the drivers handbook I would start with the fuses, if you do not know the location of the correct fuse I will dig my handbook out and look for you unless someone else beets me to it

Edit; Just noticed you have a 2004 so I am not sure if the location of the fuse on mine will be the same as on yours?
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Originally Posted by ARoosterinaRoadster View Post
Hi all. Well as the heading implies the fan has stopped working and presumably everything on the car related to Heating,Air Conditioning,cooling in the cabin has also ceased.

Any ideas please and is it something that is an easy DIY fix ?

Given the amount of rain that we're having, I wouldn't be at all surprised if your drains are blocked and water has gone into the fan/regulator


Try THIS ONE - HVAC wiring diagram is in post #24

HTH
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Diys https://www.slkworld.com/slk-r170-class-diy/
TSBs https://www.slkworld.com/slk-r170-se...campaigns-tsb/

Many tsb have also got the solution attached.
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Mine would do that on occasion and I could get it to work again by cranking the speed control back and forth a few times. Obviously check the fuses as well.
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Your description is kind of universal. I found this test procedure years ago.


The three prong connection that attaches to the regulator(resistor) should always have power from the red lead, the brown lead is ground, and the white/pink strip lead is controlled by the fan switch. With the car off, and the fan switch in the "off" position, there should be no power to the white/pink lead. With the car on, the voltage to the white/pink lead should increase as the fan switch is rotated from "off" to "high".

If there is constant power to the white/pink lead, the control panel is defective. If there is no power to the white/red lead, but the fan still runs, the regulator(resistor) is defective. This is a common problem - the regulator(resistor) fails "closed" and provides power to the fan without power from the controller (fan switch).


Resistor PN A 202 820 73 10
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#7 Old 9 Hours Ago
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Quote:
Originally Posted by Mn car guy View Post
Mine would do that on occasion and I could get it to work again by cranking the speed control back and forth a few times. Obviously check the fuses as well.
Hi all and thank you for your various info and links.

This morning the fan was fully functioning as was normal but I will get it investigated when my MB Independent returns from his hols.

Being rather short in stature I find it difficult to reach over into the central part of the windscreen to investigate the possibility of blocked drain hole scenario
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Last edited by ARoosterinaRoadster; 9 Hours Ago at 07:18 AM. Reason: Add info.
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#8 Old 4 Hours Ago
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Quote:
Originally Posted by ARoosterinaRoadster View Post
Being rather short in stature I find it difficult to reach over into the central part of the windscreen to investigate the possibility of blocked drain hole scenario

It's true that you have to reach to undo a couple of the central screws and to get a grip of the scuttle etc. but it's a job that has to be done anyway, no 'ifs' or 'buts', we've seen it too many times
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