Heater fan speed relay location - Mercedes Benz SLK Forum

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

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#1 Old 05-05-2019
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Heater fan speed relay location

Need to replace the cabin air fan speed relay...it's running at high constantly with no control. Where is the relay and is there a DIY on replacing it? Thanks.
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#2 Old 05-06-2019
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#3 Old 05-06-2019
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Quote:
Originally Posted by Gmach View Post
Need to replace the cabin air fan speed relay...it's running at high constantly with no control. Where is the relay and is there a DIY on replacing it? Thanks.
Simply put, there isn't one.
Fan speed is controlled by the HVAC Head Unit (N19) and the regulator on top of the fan working in tandem. It will be one of these two items or the fan itself. We've just been all over this approx 3 weeks ago.

READ THIS - ALL OF IT.
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File Type: pdf Blower regulator.pdf (392.6 KB, 4 views)
File Type: pdf HVACControls.pdf (1.15 MB, 3 views)
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#4 Old 05-06-2019
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Originally Posted by M4rCu5 View Post
Simply put, there isn't one.
Fan speed is controlled by the HVAC Head Unit (N19) and the regulator on top of the fan working in tandem. It will be one of these two items or the fan itself. We've just been all over this approx 3 weeks ago.

READ THIS - ALL OF IT.

Thank you....is the same procedure for the R172...2013 SLK ? Thanks
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#5 Old 05-06-2019
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Originally Posted by Gmach View Post
Thank you....is the same procedure for the R172...2013 SLK ? Thanks
you have a 2013?

but this is not updated

Vehicle: 98 SLK230 SOLD

and this thread is in the r170 section and not the r172 section

so what is up?
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#6 Old 05-07-2019
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Quote:
Originally Posted by Gmach View Post
Need to replace the cabin air fan speed relay...it's running at high constantly with no control. Where is the relay and is there a DIY on replacing it? Thanks.

As others have noted there is no relay. It is controlled by the regulator which gets different levels of voltage from the fan controller on the dash.

You can get fooled as to whether it is the controller or the regulator. Changing the regulator is easier and cheaper than the controller. I posted a procedure for testing this a couple of years ago on this site.
If you can't find it PM me and I can send it to you.
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#7 Old 05-07-2019
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Thanks Alex...I'll look for it.
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