High pitch whistle coming from engine bay

Richard199

New Member
Joined
Feb 22, 2018
Messages
7
Location
Staffs
Car
GLC 350D premium plus
I have noticed a high pitch whistling noise that comes from within the engine bay on my 2017 GLC 350D. This happens after the car has been switched off and locked for over 45 minutes or so. I have uploaded a video to YouTube showing this.


Anyone have any thoughts on this.
 

PobodY

MB Enthusiast
Joined
Aug 23, 2016
Messages
2,536
Location
Stoke-on-Trent
Car
CLK350 Sport
That is truly strange. I've got no idea what it could be, but I'd guess at something electronic like a malfunctioning alarm siren.
 
OP
OP
Richard199

Richard199

New Member
Joined
Feb 22, 2018
Messages
7
Location
Staffs
Car
GLC 350D premium plus
It does stop if you unlock the car or start it. However, once you stop the car and lock it, it then starts again. It only stops after the car cools down. It makes me thinks it is a pump or something that is whining as it pumps fluids but not sure.
 

skippyjasper

Active Member
Joined
Feb 17, 2014
Messages
157
I'm thinking along the same lines as PobodY - something electronic.

Perhaps the alarm.

If you do not lock the vehicle does it still make the noise?
 

DrewGardner

Member
Joined
Jun 25, 2018
Messages
34
Location
Frome
Car
E270 CDI estate
I have noticed a high pitch whistling noise that comes from within the engine bay on my 2017 GLC 350D. This happens after the car has been switched off and locked for over 45 minutes or so. I have uploaded a video to YouTube showing this.


Anyone have any thoughts on this.
This is a very strange noise.

It does sound pump related to me but I could be wrong

I see your car is under 3 years old so still under warranty - I would head straight round the dealer and watch them scratch their heads.
 

fabes

MB Enthusiast
Joined
Apr 12, 2007
Messages
1,716
Location
Southampton
Car
E 350CGI Coupe and QQ+2
Really weird and weirder as I had the same last night
Washed the car last night and there was an intermittent and slow whining at about the same pitch.
The car was not unlocked, so I was wondering if the jet wash had triggered a pre alarm (no electrics were active)

It went off after several minutes (felt like a long while) and seemed to be coming from the n/s/f wheel arch.....?

No fault codes showing on the TORQUE app and no battery issues (it started fine this morning)

But was worrying / is worrying....

Please let us know what you find out
 

DrewGardner

Member
Joined
Jun 25, 2018
Messages
34
Location
Frome
Car
E270 CDI estate
Really weird and weirder as I had the same last night
Washed the car last night and there was an intermittent and slow whining at about the same pitch.
The car was not unlocked, so I was wondering if the jet wash had triggered a pre alarm (no electrics were active)

It went off after several minutes (felt like a long while) and seemed to be coming from the n/s/f wheel arch.....?

No fault codes showing on the TORQUE app and no battery issues (it started fine this morning)

But was worrying / is worrying....

Please let us know what you find out
Is your car under warranty?

I would go and book a slot at the dealer as this is a pretty strange noise

Drew
 

Dec

MB Enthusiast
Joined
Jul 28, 2004
Messages
4,475
Car
C180,A.
No harm in testing the alarm.


Open the drivers window

Lock the car with the remote

Wait 1 minute for the alarm to set

Reaching in through the open window and open the door

Alarm siren should sound for 30 seconds and the hazards will flash for 3 minutes, alarm should then reset itself


Dec
 

Justintyme

Active Member
Joined
Feb 3, 2018
Messages
606
Location
Ireland
Car
Mercedes Benz w212 E Class
Apologies for piggybacking on this thread, but for the life of me, I can't figure out how to start my own thread. What is the secret??? Please tell.
There is a strange whirring / whistling noise coming from somewhere in the the dash in my w212. It happens a few seconds after turning on the ignition, and only last's a few seconds. Does not matter if the engine is running or not. Any idea's anyone?
 

fifermerc

Active Member
Joined
Apr 23, 2017
Messages
68
Car
E350
Apologies for piggybacking on this thread, but for the life of me, I can't figure out how to start my own thread. What is the secret??? Please tell.

Top right of the screen when you are looking at a forum, just below the "Search" box, you should see "Post New Thread"?
 

Justintyme

Active Member
Joined
Feb 3, 2018
Messages
606
Location
Ireland
Car
Mercedes Benz w212 E Class
Top right of the screen when you are looking at a forum, just below the "Search" box, you should see "Post New Thread"?
Hi fifermerc, Thanks for your help. I have uploaded a screen shot of what is on this page...but still cannot see "Post New Thread"..... MB Club Pic Reduced.jpg
 

Smart320

MB Enthusiast
SUPPORTER
Joined
Feb 10, 2017
Messages
2,552
Location
Carmarthen
Car
Mini Cooper, Toyota RAV4 3dr , SLK55amg ( gone )
Use the home button, then go to correct section below , in this case Engine and you will see new thread box at top on right hand.
 

Sprint-Man

Active Member
Joined
Feb 6, 2009
Messages
240
Location
Newcastle upon Tyne (Area)
Car
W209 CLK 240
Good afternoon Richard,
Sorry to hear about your problem and maybe I can assist?

1) Is the noise louder inside the engine bay - Around the fuse box?
2) If so, remove the fuse box cover - Is the noise louder?
*) My theory is that a small auxillary fan (used in cooling the AirCon condenser - I believe) located in that area is simply dirty, or more accurately the fan impeller blades are dirty?
**) It may be possible to vacuum clean the fan whilst in situ, or remove 5/7 torx screws and remove the fan/clean/refit?

I do hope you find a solution, good luck :dk:
 

et0609

Active Member
Joined
Jun 18, 2006
Messages
292
Location
Scotland
Car
E350
Sorry for resurrecting an old thread but does anyone know what this whislting noise ended up being as mine has started doing exectly the same thing. Have it booked into the dealers in a couple of weeks but would be good to give them a heads up is possible. Thanks.
 

Users who are viewing this thread

Top Bottom