Fan like whirring from dash..
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From: Manchester, UK
BMW e89 Z4 sDrive 35i & MB S205 C200 AMG Premium Plus
Fan like whirring from dash..
So tonight I got in the car and without ignition on or starting there was a noticeable fan like whirring from the dash that stopped after about a minute. Anyone else noted this? Not sure if it's perhaps the air balance system or something else. It was a bit annoying but then stopped. You can't hear it once the engine is running or the car is moving. At first I thought it might be a fan for the computer but that wouldn't have shut off after a minute of getting in the car. Sounds almost like a failing cooling fan but the car is just a week old.
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
When you open the door the CANBus wakes up.
Was the car cold? Was the key in the ignition & had the recognition handshake taken place? If so you might be hearing the excess air fan running for emissions at cold start.
If not then they must trace the noise when the CANBus comes out of hibernation. Could be a noisy HVAC sniffer fan etc.
Was the car cold? Was the key in the ignition & had the recognition handshake taken place? If so you might be hearing the excess air fan running for emissions at cold start.
If not then they must trace the noise when the CANBus comes out of hibernation. Could be a noisy HVAC sniffer fan etc.
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MBWorld Fanatic!
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From: Manchester, UK
BMW e89 Z4 sDrive 35i & MB S205 C200 AMG Premium Plus
Car was cold. Sound was central dash. I'll see if it continues but id rather put up with it than have the dash taken apart or whatever ..
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Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
EDIT: It always amuses me. I've got to be a nutter. I help my friends & people on this forum with their cars but I take my own to the dealer but on the condition that it's under my supervision. My MB owned dealership obliges.
Last edited by Glyn M Ruck; Apr 3, 2015 at 06:01 PM.
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From: Melbourne, Australia
C250
I have noticed a similar sound which start as soon as I open any of the car door. It's a low humming sound and coming from the overhead control panel. It's not noticeable unless the ambient is very quiet. And the sound goes away after a couple of minutes, accompanied by a very slight shake in the car.
Is this normal?
Is this normal?
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Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
If it's the overhead console it is the second HVAC sniffer fan coming on to accurately check inside car temp & normal. Some models have 1 sniffer fan & some 2. Closed top sedans always have one in the overhead console. It blows typical car temp air over the temperature sensor.
Last edited by Glyn M Ruck; Apr 4, 2015 at 08:12 AM.
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Thread Starter
MBWorld Fanatic!
Joined: Jan 2015
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From: Manchester, UK
BMW e89 Z4 sDrive 35i & MB S205 C200 AMG Premium Plus
It sounded like it was coming from the top of the dash somewhere behind the comand screen. I could be wrong. I've used the car for two more journeys today and I've not heard it.
Junior Member
Joined: Nov 2014
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From: Melbourne, Australia
C250
If it's the overhead console it is the second HVAC sniffer fan coming on to accurately check inside car temp & normal. Some models have 1 sniffer fan & some 2. Closed top sedans always have one in the overhead console. It blows typical car temp air over the temperature sensor.
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Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
We don't have a lot of W205 experience yet to know what's normal. It depends how sensitive you are. I'm always aware of it if I listen VERY carefully. In day to day use I don't notice it. If you have any doubts get the dealer to check it. Listen to another new car on the floor.
Junior Member
Joined: Nov 2014
Posts: 43
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From: Melbourne, Australia
C250
We don't have a lot of W205 experience yet to know what's normal. It depends how sensitive you are. I'm always aware of it if I listen VERY carefully. In day to day use I don't notice it. If you have any doubts get the dealer to check it. Listen to another new car on the floor.
Super Moderator
Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Sounds as though it's normal. Just monitor it. What I do in cases like this is to ask the dealer to note it at the first service but do nothing. Then you have it recorded by Benz & if it becomes noisier later they have to cover you & fix it.
Junior Member
Joined: Nov 2014
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From: Melbourne, Australia
C250
Good idea. Thx. I am leaving it alone for now. Will look into it either at the first service.
