Faint High Pitched noise with fan on
12-18-2009, 08:00 PM
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2010 E350 4Matic
Faint High Pitched noise with fan on
Ever since I got this car I noticed a barely audible high pitched sound (almost like a electronic amplifier noise if that makes sense). Based on a suggestion from the previous owner of the car I determined that it happens when I turn on the climate control.
Anybody know what is causing this?
Anybody know what is causing this?
12-18-2009, 10:24 PM
#2
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2007 E350 Sport
I actually have this too. I believe it is some kind of a cabin pressure issue as when I tilt my sunroof or barely crack a window it seems to go away. Close the window, it's back.
12-19-2009, 12:40 PM
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2003 E500 Benz & 2015 BMW M235ix
Are you sure it isn't the air fan motor up and behind the glove box? Could be the bearings making the noise. My actually makes initially a loud noise when starting the engine when it's really cold weather outside but then dissipates in a couple minutes. There's another recent post about motor fan noise but it's much louder issue.
12-19-2009, 03:59 PM
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All Diesel Fleet !1983 240d stick,2005 E320 CDI Midnight blue, 2005 E320 CDI, Desert Silver, Kubota
Noise
Check all the vent openings. You might have one that is almost open or almost closed, making noise.
12-21-2009, 05:44 PM
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11 ML350W2 / 17 GLC300
+1 on checking all the vents. My wife has a habit of turning off the passenger's side vent. If the fan is running at about half speed or greater, it creates a whistling sound.
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12-21-2009, 11:14 PM
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2008 Mercedes Benz E63 AMG, 2017 Porsche Macan S
Yup...I was embarassed when the SA opened up the culprit vent...
12-27-2009, 11:20 AM
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11 ML350W2 / 17 GLC300
Ouch ! I had a similar whine that got worse on an old Volvo. My solution was to lube the motor shaft. That would quiet the motor for a month or so at a time. That was a lot cheaper than trying to replace the motor.
Another thing to look at is the air intake. Does the noise change if you remove the cabin air filter? With the filter removed you can see the fan blade spinning. Is there anything touching there?
Another thing to look at is the air intake. Does the noise change if you remove the cabin air filter? With the filter removed you can see the fan blade spinning. Is there anything touching there?
Last edited by JimPurdy; 12-27-2009 at 11:23 AM.
