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  #1  
Old 07-28-2016, 02:19 PM
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Join Date: Feb 2014
Location: Oslo, Norway
Posts: 42
[m103] solved: constantly running aux fan

Just thought I should add my experience with aux fan woes. Both my fans on my 1990 300e were constantly running once I turned on the ignition. Even though the ac is not even working. I ordered coolant temp sensor and the black relais behind the fuse box. Turned out I didn't have the correct socket for the temp sensor but I replaced the relais (0015426819 in my case) and the fans are no longer running constantly. It remains to be seen wether it kicks in if the engine should start over heating. I just replaced the fan clutch and without ac too there is not much chance for that here in Norway. Anyway.

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  #2  
Old 07-28-2016, 02:41 PM
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Join Date: Dec 2006
Posts: 3,963
The black relays are no good. They should have given you the superceded part, which is an orange or green relay with the fuse built into the top.

I'm almost positive that you narrowly missed an underhood fire. Since the fans are wired directly to the battery, the relay itself incorporates a fuse. With the black relay, the fuse is internal and can't be replaced. My experience is that when the relay fail s closed, the fuse overheats and can burn the case.

http://www.peachparts.com/shopforum/attachments/diesel-discussion/131750d1440306806-troubleshooting-electric-fans-blackrelay.jpg

http://www.peachparts.com/shopforum/attachments/diesel-discussion/131751d1440306994-troubleshooting-electric-fans-orange.jpg
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  #3  
Old 08-02-2016, 02:13 AM
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Join Date: Feb 2014
Location: Oslo, Norway
Posts: 42
Oops! Interesting thanks! Anyway aux fans work as they should - kicks in when engine temp approaches 100.found out when I was parking for a long time in a very narrow spot and turned ignition on again right after I stopped.

Is there another part number for the orange relay?

Last edited by larsko; 08-02-2016 at 05:18 AM. Reason: Subscribe
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  #4  
Old 08-04-2016, 10:49 AM
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Join Date: Dec 2006
Posts: 3,963
I believe its 0015429719
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  #5  
Old 08-04-2016, 09:52 PM
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Join Date: Mar 2016
Posts: 72
Dam we should switch cars I can't get mine to even turn on lol

Sent from my VS990 using Tapatalk

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