at the headlight.
Facelift ILS LED Fans run for 40+ minutes after shutdown on warm days - normal?
Thread Starter
MBWorld Fanatic!
Joined: May 2006
Posts: 1,319
Likes: 251
From: Virginia
W212 M276 DELA 30 ; W211 M113k, W126 M117, W126 OM617, W211 OM642 ; R107 M117 X2, Sierra 1500 LZ0
Facelift ILS LED Fans run for 40+ minutes after shutdown on warm days - normal?
Was wondering if @konigstiger or anyone else might know of a bulletin or if this is expected behavior. I've had my 15 E400 for a little over 3 years and it now has 51K miles. Whenever the ambient temperature is above 65ish, the ILS LED cooling fans run for a full 30-60 minutes after every drive cycle (longer duration when higher temps). I thought this was normal until I mentioned it on thread with @S-Prihadi who indicated that seemed like a long time. I also compared this to two other W212 E350s with full ILS that are in my family (a 15 and 16 E350) and neither seem to run that long.
The fans are so aggressive that if I even open a door or unlock the car, they turn on proactively in anticipation of coming on (even if they have not yet).
Aside from the noise, this hasn't caused me any problems, but since these lamps are around 2-3K a piece, I'm wondering if I need to update coding or firmware proactively to prevent damage.
Is anyone aware of similar behavior, a workaround or TSB that relates to this?
The fans are so aggressive that if I even open a door or unlock the car, they turn on proactively in anticipation of coming on (even if they have not yet).
Aside from the noise, this hasn't caused me any problems, but since these lamps are around 2-3K a piece, I'm wondering if I need to update coding or firmware proactively to prevent damage.
Is anyone aware of similar behavior, a workaround or TSB that relates to this?
Out Of Control!!
Joined: Apr 2019
Posts: 11,924
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
temperamental LED fans...
I too got the same experience to be randomly greated by LED fans with cold lights Off.
I think these cooling fans are controlled by the F-SAM acting on internal sensors.
So far I don't have hands-on to deal with the internal module. I know that when you lock the car it shuts down the fans in a hury.
I wonder if the blown air source is filtered or if they the fan blades get plugged up with outdoor crud?
I think these cooling fans are controlled by the F-SAM acting on internal sensors.
So far I don't have hands-on to deal with the internal module. I know that when you lock the car it shuts down the fans in a hury.
I wonder if the blown air source is filtered or if they the fan blades get plugged up with outdoor crud?
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Joined: May 2018
Posts: 6,602
Likes: 6,549
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Thread Starter
MBWorld Fanatic!
Joined: May 2006
Posts: 1,319
Likes: 251
From: Virginia
W212 M276 DELA 30 ; W211 M113k, W126 M117, W126 OM617, W211 OM642 ; R107 M117 X2, Sierra 1500 LZ0
I too got the same experience to be randomly greated by LED fans with cold lights Off.
I think these cooling fans are controlled by the F-SAM acting on internal sensors.
So far I don't have hands-on to deal with the internal module. I know that when you lock the car it shuts down the fans in a hury.
I wonder if the blown air source is filtered or if they the fan blades get plugged up with outdoor crud?
I think these cooling fans are controlled by the F-SAM acting on internal sensors.
So far I don't have hands-on to deal with the internal module. I know that when you lock the car it shuts down the fans in a hury.
I wonder if the blown air source is filtered or if they the fan blades get plugged up with outdoor crud?
MBWorld Fanatic!
Joined: Sep 2018
Posts: 3,243
Likes: 932
From: New Orleans Area
2015 E400 Sedan
Same here 2015 E400 Fancy headlights.
Park it, turn off engine, get out.
Shut door and go inside.
Read a book and go back into garage for a beer.
AND YES the dayum fan is still running...
My worry is it kills the battery
I mean how hot do these get
I was always told LED generate way less heat then other types of lights.
So what are we cooling? computer boards? OMG if we are... as underhood temps get crazy hot
And I looked in the manual and cannot find any reference but maybe I missed it as it is crazy thick book too.
Park it, turn off engine, get out.
Shut door and go inside.
Read a book and go back into garage for a beer.
AND YES the dayum fan is still running...
My worry is it kills the battery
I mean how hot do these get
I was always told LED generate way less heat then other types of lights.
So what are we cooling? computer boards? OMG if we are... as underhood temps get crazy hot
And I looked in the manual and cannot find any reference but maybe I missed it as it is crazy thick book too.
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Joined: Oct 2005
Posts: 4,957
Likes: 1,640
Locking the car shuts them down for me and mine is garaged like yours. If I don’t lock it they will run for awhile, shut down, then start running again whenever they feel like it. Once I noticed that I started locking it after every drive.
Thread Starter
MBWorld Fanatic!
Joined: May 2006
Posts: 1,319
Likes: 251
From: Virginia
W212 M276 DELA 30 ; W211 M113k, W126 M117, W126 OM617, W211 OM642 ; R107 M117 X2, Sierra 1500 LZ0
I'm going to give that a shot... if that is the solution, I wonder what the logic behind that is.. Today or tomorrow should be a hot one, so I'll post back my results.
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Thread Starter
MBWorld Fanatic!
Joined: May 2006
Posts: 1,319
Likes: 251
From: Virginia
W212 M276 DELA 30 ; W211 M113k, W126 M117, W126 OM617, W211 OM642 ; R107 M117 X2, Sierra 1500 LZ0
It really makes you appreciate how they managed to achieve so many modern creature comforts in a W126 (everything was hard wired, engine management was very basic). It's also why much of that stuff still works on a W126 and W124 after all these years. Not a whole lot to go wrong.
Last edited by DubVBenz; Jun 22, 2022 at 04:16 PM.
