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#1
02-14-2006, 10:04 PM
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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
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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
02-15-2006, 07:40 AM
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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
02-15-2006, 08:08 AM
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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
02-15-2006, 10:06 AM
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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
02-15-2006, 11:18 AM
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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
02-15-2006, 11:57 AM
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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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