Does anyone have this sound?
Thread Starter
Super Member
Joined: May 2002
Posts: 572
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From: Canada
2015 C63S E1 (sold 2012 C63 AMG Sedan (Premium & APX)) & 09 C300 Sport 4Matic
Does anyone have this sound?
The car is a 2001 C240.
With the engine turned off, after it has been run for a while, a sound can be heard from under the hood. It's a short buzzing or hissing sound. It reminds me of a pressure relief noise only buzzier. It lasts for up to 2 or 3 seconds and than stops. It can start again every so often. Sometimes even an hour after the car has been parked.
With the hood open I can't really localize the source. Is it the A/C plumbing? Annoying not knowing what it is.
..jack
With the engine turned off, after it has been run for a while, a sound can be heard from under the hood. It's a short buzzing or hissing sound. It reminds me of a pressure relief noise only buzzier. It lasts for up to 2 or 3 seconds and than stops. It can start again every so often. Sometimes even an hour after the car has been parked.
With the hood open I can't really localize the source. Is it the A/C plumbing? Annoying not knowing what it is.
..jack
Thread Starter
Super Member
Joined: May 2002
Posts: 572
Likes: 3
From: Canada
2015 C63S E1 (sold 2012 C63 AMG Sedan (Premium & APX)) & 09 C300 Sport 4Matic
Mystery Sound
The fan does not turn at all when the noise is heard, the engine is off of course. It's like a slight buzzing for a second or two, than stops, come back in a while. Eventually it stops. maybe when the car is fully cold or the AC has settled down.
What is it?
What is it?
Last edited by Pit-Pony; Nov 10, 2002 at 09:25 AM.
MBWorld Fanatic!
Joined: Nov 2001
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From: Gaithersburg, MD
2002 C240 6-spd (ret)
Originally posted by Lynn
I think it is the electric radiator fan.
I think it is the electric radiator fan.
Thread Starter
Super Member
Joined: May 2002
Posts: 572
Likes: 3
From: Canada
2015 C63S E1 (sold 2012 C63 AMG Sedan (Premium & APX)) & 09 C300 Sport 4Matic
It's not the fan I'm talking about. I am referring to a very low pitched sound. You have to be very close to the car to hear it. Hood open is best. A slight intermittent buzzing/hissing sound once the engine is off.
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Joined: Dec 2001
Posts: 572
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From: Oro Valley, AZ
2001 C240 6spd
Re: Does anyone have this sound?
Originally posted by Pit-Pony
The car is a 2001 C240.
With the engine turned off, after it has been run for a while, a sound can be heard from under the hood. It's a short buzzing or hissing sound. It reminds me of a pressure relief noise only buzzier. It lasts for up to 2 or 3 seconds and than stops. It can start again every so often. Sometimes even an hour after the car has been parked.
With the hood open I can't really localize the source. Is it the A/C plumbing? Annoying not knowing what it is.
..jack
The car is a 2001 C240.
With the engine turned off, after it has been run for a while, a sound can be heard from under the hood. It's a short buzzing or hissing sound. It reminds me of a pressure relief noise only buzzier. It lasts for up to 2 or 3 seconds and than stops. It can start again every so often. Sometimes even an hour after the car has been parked.
With the hood open I can't really localize the source. Is it the A/C plumbing? Annoying not knowing what it is.
..jack
