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Power steering whining noise

Tiny
RAMACHEZ
  • MEMBER
  • 2005 MERCEDES BENZ ML500
  • 0.5L
  • V8
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
My 2005 Mercedes Benz ML500 V8 has this power steering whining irritating noise. I changed the pump and reservoir with genuine parts but the noise is still loud and persistent. No one seems to know how to solve this problem. What do you think?
Friday, October 2nd, 2015 AT 4:04 PM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,607 POSTS
Hey Ramachez,

If you look inside the reservoir with the engine running does it look like the fluid has air in it? Believe it or not, I just did one of these, and Mercedes sells an updated "O" ring between the pump and reservoir, the old one leaks air into the system which makes noise, replace it and the problem should go away.

Here is the video

https://youtu.be/uYaY-JeJWYQ

Please let me know what happens

Best, Ken
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Wednesday, October 7th, 2015 AT 3:58 PM
Tiny
RAMACHEZ
  • MEMBER
  • 3 POSTS
Will try it Ken. If it works, I will certainly make a donation. Thanks and much appreciation. Randy.
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Thursday, October 8th, 2015 AT 2:07 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Looking forward to the results :-)

Best, Ken
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Saturday, October 10th, 2015 AT 9:44 AM
Tiny
RAMACHEZ
  • MEMBER
  • 3 POSTS
Hi Ken: What is the part number of the updated O ring seal? Thx.
Randy
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Sunday, October 11th, 2015 AT 4:39 PM
Tiny
KEN L
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Hey Ramachez,

If you order a new seal, it is already updated.

Best, Ken
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Sunday, October 11th, 2015 AT 9:12 PM
Tiny
TUCSON TONY
  • MEMBER
  • 1 POST
Ramchez Did it work I’m having the same problem
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Wednesday, February 6th, 2019 AT 8:49 PM
Tiny
KEN L
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  • 47,607 POSTS
Yes this works here is the video of the job being done

https://youtu.be/uYaY-JeJWYQ

Please let us know if you need anything else to get the problem fixed.
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Saturday, February 9th, 2019 AT 10:12 AM

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