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M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

Radiator fan not coming on

     
Old Jul 27, 2013 | 02:58 PM
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ML500
Radiator fan not coming on
I have a new to me 2003 ML500 and my radiator fan is not coming on. We have replace the engine cooling temp sensor, checked all fuses and relays that would be associated with this and also checked the thermostat. Any idea on other things that we should check or what might be the problem?
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Old Jul 28, 2013 | 02:26 AM
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2002 ML 320 & 2006 ML500
ML 55's and 500's have a special fuse off the battery to run the fans.
Attached Thumbnails Radiator fan not coming on-fan-fuse-ml-55-500-1.jpg   Radiator fan not coming on-fan-fuse-ml-55-500-3.jpg  
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Old Jul 28, 2013 | 03:19 PM
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The fuse is good.
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Old Jul 28, 2013 | 07:21 PM
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Then you have to check the wiring at the fan itself.

Check the RED wire for 12v and check the BROWN wire for ground.

The WHITE wire is the signal wire from the ECM to turn the fan on.
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Old Jul 28, 2013 | 08:18 PM
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Grab a volt meter and see if its getting any power in the line at all
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Old Jun 20, 2019 | 10:57 AM
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ML500
Fan fuse
Originally Posted by Maj. Dundee
ML 55's and 500's have a special fuse off the battery to run the fans.
Where can I buy one of these fuses, item 21 on your diagram
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Old Jun 20, 2019 | 03:13 PM
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02w163ML500 / 97w210E50AMG / 99w202C230k / 95w124500e-wip
Originally Posted by Mark Entwistle
Where can I buy one of these fuses, item 21 on your diagram
If you can't find it, option 2.
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Old Jun 21, 2019 | 05:27 AM
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Originally Posted by Mark Entwistle
Where can I buy one of these fuses, item 21 on your diagram
Ignore this post and see the one below.
Last edited by Maj. Dundee; Jun 21, 2019 at 05:35 AM.
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Old Jun 21, 2019 | 05:34 AM
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At a M/B dealership and the correct one depends on the last six numbers of your vin#.
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