Whining noise once warmed up - any ideas?
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Joined: Jul 2012
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From: Melbourne, Australia
2013 C63 PP
Whining noise once warmed up - any ideas?
My car is making a whining noise, but it’s not there when I start the car. It only starts once warmed up. And then after a while it goes away. Have a listen with headphones - it’s dependant on the revs. Any ideas?
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Mercedes CLA 250
Ah, the classic mystery whine! My money’s on a belt or pulley. Mine used to whine like that before I had to replace the alternator. Keep an eye (or ear) on it, those noises have a habit of turning into breakdowns at the worst times.
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S550 V8, CL600 V12, SLK32 AMG
Take the serpentine belt off. Just make sure how to route it back again.
Then spin all the pulleys by hand. If you hear a noise, thats the one.
Depending on how old your car is, its probably not a bad idea to just replace at least the belt and the idler pulleys.
Then spin all the pulleys by hand. If you hear a noise, thats the one.
Depending on how old your car is, its probably not a bad idea to just replace at least the belt and the idler pulleys.
Last edited by waterzap99; Apr 9, 2025 at 10:02 AM.
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From: Melbourne, Australia
2010 ML550 VIN WDC1641722A564750, 2010 B180
If the other suggestions don't yield a result, try listening to the PCV system that might be malfunctioning. There are centrifugal weight that creates a vacuum on the back side of one cylinder head usually the left one. They do fail and cause a while when they do. Easy changeout that should be done as a service item but typically isn't.
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2005 e55 AMG
I have been chasing the same thing with the mystery whine. Leaning towards a ac bearing or power steering, but it is not typical of a bearing sound, it's higher pitched.
Did you guys ever notice a whine coming from the oil filter housing?? Thats a strange one for sure. Sounds like my E55 oil pump whine they are known for.
Did you guys ever notice a whine coming from the oil filter housing?? Thats a strange one for sure. Sounds like my E55 oil pump whine they are known for.
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From: Melbourne, Australia
2013 C63 PP
Thanks for the suggestions. This guy had the same symptoms and managed to fix the problem.
It seems our power steering fluid reservoir has a filter which you can’t change – you have to replace the whole reservoir. This seems the most likely scenario - a clogged filter. I’ve got a service coming up so will get a quote on doing replacing it.
Last edited by Mr Jones; Apr 11, 2025 at 03:28 AM.
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Thanks for the suggestions. This guy had the same symptoms and managed to fix the problem.
his guy had the same symptoms and managed to fix the problem.
It seems our power steering fluid reservoir has a filter which you can’t change – you have to replace the whole reservoir. This seems the most likely scenario - a clogged filter. I’ve got a service coming up so will get a quote on doing replacing it.
his guy had the same symptoms and managed to fix the problem.
It seems our power steering fluid reservoir has a filter which you can’t change – you have to replace the whole reservoir. This seems the most likely scenario - a clogged filter. I’ve got a service coming up so will get a quote on doing replacing it.
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From: New Hampshire
ML 63 AMG
Originally Posted by Mr Jones;[url=tel:9142598
9142598[/url]]Thanks for the suggestions. This guy had the same symptoms and managed to fix the problem.
his guy had the same symptoms and managed to fix the problem.
It seems our power steering fluid reservoir has a filter which you can’t change – you have to replace the whole reservoir. This seems the most likely scenario - a clogged filter. I’ve got a service coming up so will get a quote on doing replacing it.
his guy had the same symptoms and managed to fix the problem.
It seems our power steering fluid reservoir has a filter which you can’t change – you have to replace the whole reservoir. This seems the most likely scenario - a clogged filter. I’ve got a service coming up so will get a quote on doing replacing it.
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2005 e55 AMG
I was leaning towards that but the sound is consistent cold or hot and does not change with turning the wheel which you would think it would change like most do.
Already changed all the pulleys as well.
Sorry about hijacking the thread but thought this post was in the same catagory.
Already changed all the pulleys as well.
Sorry about hijacking the thread but thought this post was in the same catagory.
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From: Texas
10 C six trizzle
It's pretty normal for these power steering pumps to fail, they dont love living at 7000rpm and not a great cooler capacity. Combine that with drifting or road racing and you'll kill 3 in 60-70k miles.
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From: Melbourne, Australia
2010 ML550 VIN WDC1641722A564750, 2010 B180
I doubt it's the filter in the power steering reservoir. See this post that shows how small and fragile it is.
https://mbworld.org/forums/m-class-w...ng-filter.html
https://mbworld.org/forums/m-class-w...ng-filter.html
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From: Melbourne, Australia
2013 C63 PP
Thanks for everybody’s input. Turns out, in my case it WAS the power steering reservoir, and I’m assuming because of the filter. Got the dealer to put in a new one and the whining has gone.
