moaning
Thread Starter
Member
Joined: Feb 2018
Posts: 227
Likes: 55
CL500, W212 e350 mega-spec
moaning
Just bought a 2005 CL500 and it has a moan coming from the engine bay which goes up and down with RPM. Once underway and settled into a cruise you can't hear it so it's not too disturbing at the moment.
I've already replaced the alternator because that had an actual issue which has now been rectified and it made no difference to the moaning.
Is there a common failure with these cars, it's low mileage and well serviced.
The other possibilities I'm aware of are:
1. One of the idler pulleys
2. Power steering pump
3. Air conditioning compressor
4. Something else
I did spin all the various pulleys when I changed the alternator and there was nothing particularly obviously noisy at that point.
I've already replaced the alternator because that had an actual issue which has now been rectified and it made no difference to the moaning.
Is there a common failure with these cars, it's low mileage and well serviced.
The other possibilities I'm aware of are:
1. One of the idler pulleys
2. Power steering pump
3. Air conditioning compressor
4. Something else
I did spin all the various pulleys when I changed the alternator and there was nothing particularly obviously noisy at that point.
Super Member
Joined: May 2021
Posts: 554
Likes: 150
From: Netherlands
CL 600 '00 5.8L V12
Thread Starter
Member
Joined: Feb 2018
Posts: 227
Likes: 55
CL500, W212 e350 mega-spec
Not getting any ABC errors
Just bought a 2005 CL500 and it has a moan coming from the engine bay which goes up and down with RPM. Once underway and settled into a cruise you can't hear it so it's not too disturbing at the moment.
I've already replaced the alternator because that had an actual issue which has now been rectified and it made no difference to the moaning.
Is there a common failure with these cars, it's low mileage and well serviced.
The other possibilities I'm aware of are:
1. One of the idler pulleys
2. Power steering pump
3. Air conditioning compressor
4. Something else
I did spin all the various pulleys when I changed the alternator and there was nothing particularly obviously noisy at that point.
Just bought a 2005 CL500 and it has a moan coming from the engine bay which goes up and down with RPM. Once underway and settled into a cruise you can't hear it so it's not too disturbing at the moment.
I've already replaced the alternator because that had an actual issue which has now been rectified and it made no difference to the moaning.
Is there a common failure with these cars, it's low mileage and well serviced.
The other possibilities I'm aware of are:
1. One of the idler pulleys
2. Power steering pump
3. Air conditioning compressor
4. Something else
I did spin all the various pulleys when I changed the alternator and there was nothing particularly obviously noisy at that point.
Senior Member
Joined: Aug 2007
Posts: 285
Likes: 27
From: Calgary Alberta Canada
2001 Mercedes CL500 2006 E350 4-matic
Are you a moderator for this site, since you are asking him to provide information that are usually asked by the moderator....???
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Super Member
Joined: May 2021
Posts: 554
Likes: 150
From: Netherlands
CL 600 '00 5.8L V12
Do you think it makes a difference if the ABC is being serviced by a dealer or an experienced independent mechanic. I prefer the experienced independent mechanic with lots of ABC knowledge over a modern dealership with newly hired technicians that never had any experience with the ABC system....
I'm not, but I come across a lot of posts when answering people, and I can't remember all of their cars XD
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Thread Starter
Member
Joined: Feb 2018
Posts: 227
Likes: 55
CL500, W212 e350 mega-spec
I think I've worked out what this is. There was a Mercedes technical bulletin for the pulsation damper. It's going to cost about £60 for the part and should be pretty easy to change.
The noise you can hear when this guy first starts the car (before he revs it) is the same as what I hear.
This topic covers it and has the TSB attached: abc pump or power steering whinning noise Please help - MBWorld.org Forums
The noise you can hear when this guy first starts the car (before he revs it) is the same as what I hear.
This topic covers it and has the TSB attached: abc pump or power steering whinning noise Please help - MBWorld.org Forums
