Odd Hum for 2 minutes after shutting down
#1
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2018 C43 AMG, Previous 2016 E550 Coupe, Previous 2012 E550 Coupe
Odd Hum for 2 minutes after shutting down
My wife just picked up a 2014 E350 with most of the goodies. It replaces her previous E350 and I have a 2012 E550c.
I noticed after we brought it home and shut it off in the garage there is an odd hum - quite loud - I can even hear it a bit through the walk in door to the garage.
The sound is coming from somewhere in the engine compartment area. I haven't timed it but it's a least a couple of minutes then it stops and silence.
We have never noticed this sound with the other MB's - anyone else have this experience with 2014 E350.
Thanks all
I noticed after we brought it home and shut it off in the garage there is an odd hum - quite loud - I can even hear it a bit through the walk in door to the garage.
The sound is coming from somewhere in the engine compartment area. I haven't timed it but it's a least a couple of minutes then it stops and silence.
We have never noticed this sound with the other MB's - anyone else have this experience with 2014 E350.
Thanks all
#2
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I believe that noise is the LED fans at the heat sink. It think it is totally normal, as well as annoying.
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
Agreed... Same in both 550s
#6
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Seems like a good idea!
#7
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Ahh, so the LEDs are a solution to a problem that didn't exist, all in the name of vanity. We now have headlights that require cooling as if they're a DLP projector bulb. What this means is that if the cooling is ever inadequate, the lifespan of the LED will be lowered. Not to mention, a whole different set of moving parts designed just to keep the LED from melting.
Seems like a good idea!
Seems like a good idea!
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#8
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I love the S-Class, but I find myself longing for a 212 as a replacement because it can be had without the complicated suspension bits...
I love the look of the facelift, but if cooling fans are required to keep LEDs (which, by their very nature, should be more efficient than anything they replace), I will happily pass.
I've owned MBs from the late 70s until the late 2010s and this is just ****ing crazy talk.
#9
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Since the LED lamps don't put out any heat forward to keep the lens warm they may be using the fans to move heat forward to melt ice, etc. I have heard that the LED headlamps in some cars have icing issues. Okay, if you live in a warm climate.
#10
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There are actually three fans in each LED headlight....and they do run for a while after the car stops. I don't even want to think what a replacement headlight assembly costs
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#11
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'10 F150 FX4 SCrew. '14 S212S
I don't think that is the hum you are talking about. Only reason I say that is that if I lock the car, the hum shuts down. If the LEDs are in fact "hot," I would expect that the fans would continue until the units are cool and not turn off when I lock the car. Also, I get this humming first thing in the morning.
I figure that mine is for the air suspension, but I am guessing it is not as others without air suspension are reporting the same noise.
I figure that mine is for the air suspension, but I am guessing it is not as others without air suspension are reporting the same noise.
#12
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I don't think that is the hum you are talking about. Only reason I say that is that if I lock the car, the hum shuts down. If the LEDs are in fact "hot," I would expect that the fans would continue until the units are cool and not turn off when I lock the car. Also, I get this humming first thing in the morning.
I figure that mine is for the air suspension, but I am guessing it is not as others without air suspension are reporting the same noise.
I figure that mine is for the air suspension, but I am guessing it is not as others without air suspension are reporting the same noise.
Airmatic only hums when it is pumping air. So that might explain the humming in the morning. When you get out of the car it should "queef" or "fart" to release air, it should not hum.
#13
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Airmatic does not make a noise like this and yes it burbs, hisses, farts as it levels itself after stopping. These E class cars continue the tradition of being the noisiest cars on the planet. My E500 took some getting used to and now I hardly notice all of the noises they make. Passengers are always curious with the sounds, especially the gas noises when we walk away, as if it is giving us the old raspberry tongue.
Last edited by KEY08; 03-31-2014 at 09:22 AM.
#14
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'10 F150 FX4 SCrew. '14 S212S
I was thinking it was related to the compressor. The farts are obvious.
When I opened the door this morning, the hum started right away. Why would the LED need cooling right away? Also, why does the hum not appear even when the headlights are on?
When I opened the door this morning, the hum started right away. Why would the LED need cooling right away? Also, why does the hum not appear even when the headlights are on?
#15
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19 E63s(wifeys) & a 21 GLE580
My stealership said it was the fans on the lights and mine come just about anytime for any reason. I was in the garage last night and the car had not moved in hours and the fans came on just because I walked by it. And so many people say I'm cold hearted?!?!
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
I notice that if I open the door to get something inside the car it'll set the fans off...
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Last edited by stale-bread; 04-03-2014 at 10:02 PM.
#18
Since I read this thread, I paid attention to my 2014 E550 (which has the LED headlights)...
After I stopped the car in my quiet garage, I tried to hear the LED headlight fans. On mine, the fans were not that loud...I had to put my head so close to the LED headlight that my ear was almost touching the housing, until I heard some fan noise (sounds similar to those small fans inside a laptop computer.)
On a side note, the 2014 E-Class (both Xenon and LED headlights) no longer needs to have the headlight cleaning system.
After I stopped the car in my quiet garage, I tried to hear the LED headlight fans. On mine, the fans were not that loud...I had to put my head so close to the LED headlight that my ear was almost touching the housing, until I heard some fan noise (sounds similar to those small fans inside a laptop computer.)
On a side note, the 2014 E-Class (both Xenon and LED headlights) no longer needs to have the headlight cleaning system.
Google translation: Now the facelift offers Daimler in the Mecedes E-class headlight cleaning system to no more. According to recent studies, wiping water residue can dazzle oncoming traffic - which is supposed to prevent the wash. Prescribed the shower lamp is only from a brightness of 2000 lumens. Daimler's headlights do not reach this value.
http://www.autobild.de/artikel/merce...r-4417054.html
http://www.autobild.de/artikel/merce...r-4417054.html
#19
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^ dazzle oncoming traffic? what the? So, I guess when it is raining out at night we should turn our lights off, so we don't dazzle that oncoming traffic? Okay....
#21
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'15 E350 4M Sport
I know last post was several months ago but anyway... ref: post by Konigstiger 10-07-2014, 03:53 PM
https://mbworld.org/forums/e-class-w...2-sedan-9.html
LI82.10-P-059909 SEPT14 – 207, 212 with full LED headlamps (640) as of 2014 noise from headlamp area with vehicle parked and ignition off. Headlamp cooling fans may run for an extended duration due to latent engine heat or other ambient temperature related factors. If headlamps are fully functional and no fault codes are found this is considered normal.
https://mbworld.org/forums/e-class-w...2-sedan-9.html
LI82.10-P-059909 SEPT14 – 207, 212 with full LED headlamps (640) as of 2014 noise from headlamp area with vehicle parked and ignition off. Headlamp cooling fans may run for an extended duration due to latent engine heat or other ambient temperature related factors. If headlamps are fully functional and no fault codes are found this is considered normal.
#22
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2015 E250 BT 4M
LED headlights not only offer brighter lights, but also a much longer service life than bi-zenons (approx. 10 years vs 4 years average for bi-zenons). A little humming noise from cooling fans seems like a very minor issue to me given the added benefits of LEDs.
#24
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Jury is still out on LED. It's not the lamps and there longevity that I worry about but the heat sinks, fans and other stuff that could fail. I'm on my 3rd MB with bi-xenons and have never had a failure yet.
#25
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2015 E250 BT 4M
All of the LEDs and their attendant parts are covered for four years under the Canadian warranty for MB, whereas bi-zenons are only covered for two years.