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-   -   C280 making loud humming noises from the vents. (http://www.peachparts.com/shopforum/showthread.php?t=242250)

C280 Sport 01-09-2009 01:54 PM
C280 making loud humming noises from the vents.
 
C280 while driving it the AC/HEAT system makes a loud humming noise. Almost like the fan needs to be oiled or something. When I hit the breaks it noise stops but when i let my foot off the break it humms again:rolleyes:. This is very weird. Also it does it when the fan speed is on very low also. I look around and couldn't find any answers. Any suggestions would be great thank you.

mpolli 01-09-2009 02:45 PM
You might inspect the cabin filter.

C280 Sport 01-09-2009 03:05 PM
Had the cabin filter changed 2 weeks ago. Any other possile things?

dpkreuze 01-09-2009 03:13 PM
Water, leaves, mice, seeds, dog food, all have been found in the blower housing.

C280 Sport 01-09-2009 03:56 PM
Quote:
Originally Posted by dpkreuze (Post 2073424)
Water, leaves, mice, seeds, dog food, all have been found in the blower housing.
Well here is this thing. I took out the glove compartment and checked the filter and found nothing. Looks clear and clean. But I dont know how to get to the blower. I know I am really close to it. But yet I am so far away from finding this issue that has drove me nuts since day one :mad:

Ethan 01-09-2009 05:18 PM
The blower is situated above and to the right of the cabin filter. you push aside a wiring-loom. slide some white fasteners on the edges of a black panel, and remove the blower with maybe five or six torx(I think) screws.

In the eleven years I've had my C230 I've had to clean the blower three or four times to get rid of a noise caused by debris.

Does the noise change as you change FAN speed? if the frequency changes with fan speed then you know it's the blower.

C280 Sport 01-09-2009 07:01 PM
You can onlu hear it when it is on low. You can hear it a little bit when its on high. Its still the same noise you can only hear it more when the fan is on low. Also it does it when going aound a corner and turring to the right.

Ethan 01-09-2009 07:35 PM
from your description it could be drivetrain or brakes, but the fan blower seems like a good start, once you get into the blower you can clean out the ducting with some Lysol and really treat the HVAC.

C280 Sport 01-10-2009 10:47 AM
[quote=Ethan;2073671]from your description it could be drivetrain or brakes quote]

How could it be the drivetrain or brakes?:confused:

Ethan 01-10-2009 01:12 PM
it's hard to diagnose sound issues on a forum. when I read your post I'm not reading anything about not hearing the sound when the HVAC system is turned off.

also you say you hear the whine when driving and a HVAC blower issue should be apparent when the car is stopped. Of course air flow when moving could move debris into the path of the blower fan.

I just don't want to convey as a fact that it is your blower motor.

I hope you post some more information and let us know how things go so we can fix it.

C280 Sport 01-10-2009 04:51 PM
Quote:
Originally Posted by Ethan (Post 2074250)
it's hard to diagnose sound issues on a forum. when I read your post I'm not reading anything about not hearing the sound when the HVAC system is turned off.

also you say you hear the whine when driving and a HVAC blower issue should be apparent when the car is stopped. Of course air flow when moving could move debris into the path of the blower fan.

I just don't want to convey as a fact that it is your blower motor.

I hope you post some more information and let us know how things go so we can fix it.
Ok update time. There is no noise comming from the system when it is shut off. But when it is turned on it starts with the noise and then goes away. Start driving it goes away untill you come to a stop then it starts again but while hitting the brreaks:confused:. Take a corner to the right and at about half way for a first turn it comes on again:confused:. This is one of those weird issues. Its got to be the blower I would guess:confused:

mpolli 01-10-2009 05:07 PM
Something in/on the blower that moves around as you drive.

C280 Sport 01-10-2009 10:10 PM
Quote:
Originally Posted by mpolli (Post 2074396)
Something in/on the blower that moves around as you drive.
Yes it has to be. Its the only thing I can think of. I have my service B next thursday so I told the shop to take a look at the fan as well.

mpolli 01-11-2009 01:56 AM
That is a half hour job that will probably be 1.5 hr on your bill. I would just take out the fan myself and take a look. I like to keep what little money I have left.

bobs 01-11-2009 06:10 AM
I just went through a similar adventure on my S420. The blower would squeal only when accelerating. I pulled the blower and lubed the bearings and the noise went away. The whole job took about 1/2 hour, just like mpolli said.


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