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  #1  
Old 02-14-2006, 11:04 PM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
2000 C280 high-pitched sound behind dash

Hi All,

This just started yesterday evening when I drove home:
A high pitched (about 10kHz or so) realtively loud sound started coming from (as far as I can tell) behind the air inlets in the middle of the dash. It gets louder for about 5 seconds, stays for 5 seconds and then fades out. It happens about every minute. It has nothing to do with my stereo - although the noise is as it would come from some speakers. Could it be the hands-free speakers for the integrated cell phone? Anybody?

Thanks,

Greg
__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
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  #2  
Old 02-15-2006, 08:40 AM
69 mercedes 220d
 
Join Date: Oct 2005
Location: Bozeman, Montana
Posts: 417
noise

Could be a vacuum leak, but the one minute periodicity is a bit puzzling. If the sound disappears as long as you're on the cell phone I doubt it's the speakers for your cell. Vacuum leak sounds likely, I would think.
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  #3  
Old 02-15-2006, 09:08 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
A/C system vacuum leak is the MOST likely.. does that happen in the heating & A/C mode...WHAT about in the EC mode.. THE fresh air door vacuum element is a constant problem on the 1994-2000 W202 chassis
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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  #4  
Old 02-15-2006, 11:06 AM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
My climate control was on Off.
__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
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  #5  
Old 02-15-2006, 12:18 PM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
what is the purpose of the fresh air door vacuum element and where is it located?

Thanks,

Greg
__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
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  #6  
Old 02-15-2006, 12:57 PM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
WITH the system off .... the fresh air vacuum element DOES have vacuum applied to close that door... that would be the NOISE...
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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  #7  
Old 02-15-2006, 12:58 PM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
is this an easy fix?
__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
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  #8  
Old 02-20-2006, 03:11 AM
Registered User
 
Join Date: May 2002
Location: ON., CANADA
Posts: 19
I too am interested if this is an easy fix? The same problem occurs with my '98 C230, the high pitch squeel only occurs when the climate control unit is OFF. But as soon as I turn the system ON, either with "EC" on or off, the sound disappears.

I've always suspected the blower motor is the main culprit, it does make a loud noise especially when it is 14 or below outside. Your help is appreciated!
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1998 C230
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  #9  
Old 02-20-2006, 09:06 AM
Registered User
 
Join Date: Dec 2002
Location: Fairfax, VA
Posts: 520
About 2 months ago with the advent of cold temperature, a similar problem began when starting my 94 E320 after all night in the garage. An annoying squeal from behind the dash on the passenger side. Occurs with the climate control either on or off; continues about 10 minutes then stops. Annoying but I'll live withit until I replace my leaking A/C evaporator.
regards,
Mark
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  #10  
Old 02-20-2006, 09:10 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The fresh air door vacuum element takes a good MB tech about 4.5-5 hrs to install. The dash does have to be removed.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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  #11  
Old 02-20-2006, 10:55 AM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
Well then i'll just keep my A/C on EC.
__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
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  #12  
Old 08-24-2007, 12:05 AM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
Any chance thaere is or was a recall on this?

I am really annoyed by that noise. Now it even happens every now and then if the fan is running on low. I have had my fair share of problems with the climate control (fading display that needed a disassembly, cleaning and tightening. I am not very happy with the quality of this car (I do not mean to start flame on this issue).

Anyway, is there any chance there was a recall or that one could be made as this seems to be a very common problem?

Thanks,

Greg
__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
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  #13  
Old 08-25-2007, 04:35 AM
blackmercedes's Avatar
Just a guy
 
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Mercedes, recall? HAHAHAHAHAHAHAHAHAHA!
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John Shellenberg
1998 C230 "Black Betty" 240K

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  #14  
Old 08-25-2007, 02:32 PM
CamelotShadow's Avatar
Registered User
 
Join Date: Aug 2007
Location: Valley Village, CA
Posts: 1,163
Quote:
Originally Posted by M.B.DOC View Post
The fresh air door vacuum element takes a good MB tech about 4.5-5 hrs to install. The dash does have to be removed.
Wow, gives a new meaning to hard llabor
I think I'd have to learn to live w the noise.
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