W211 AMG Discuss the W211 AMG's such as the E55 and the E63

Power Steering Pump making noises

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Old Oct 16, 2009 | 02:47 PM
  #1  
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E55
Power Steering Pump making noises

I started my car up this morning and it had the typical supercharger whine that it always does but upon turning out of my driveway, there was a distinct power steering pump whine that got really loud when turning the wheel. It's a little harder to steer when it makes the noise but not unbearable. It seems like it's low on fluid because once i drove a few miles, the sound nearly went away and the steering went back to normal. I'm assuming this is because the fluid got hot and expanded. My question is-where to I check the fluid level at? I apologize if this is in the manual. I'm at the office and my manual is at home.
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Old Oct 16, 2009 | 03:47 PM
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2006 E55, 2012 Jeep SRT, 2008 G37s 6MT (The Mrs.), 2005 Explorer
It's one of the caps next to the oil filter. It's got a little dipstick on it. FYI my dipstick was loose and fell into the reservoir when I was checking mine. Mine did the same thing except for the steering getting rough, the PS pump just got noisy. It was a bit low, filled it up and haven't had a problem in 2 months. I checked the level the other day and it was fine.
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Old Oct 16, 2009 | 04:20 PM
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I just started having this prob week ago, was going to take in for warranty, but if EZ fix like this I'll chk PS level ASAP thanks!
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Old Oct 16, 2009 | 05:44 PM
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Pardon my ignorance- does it just take standard PS fluid?
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Old Oct 16, 2009 | 07:12 PM
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I just got back from Dealership, you should only put MB PS fluid in these things. They topped it off for me FREE! noise is gone
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Old Sep 16, 2010 | 10:46 AM
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2009 E63
I think Im having this issue right now... is the PS fluid the small black cap that is right next to the oil filter with no label?
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Old Sep 16, 2010 | 11:54 AM
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2003 W211 E55, 2003 W220 S600
all MB's 03 and later use the Pentosin Fluid as the PS fluid. 13.65 buck a liter at the dealership
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Old Sep 16, 2010 | 01:15 PM
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dumb question.... but i was having that loud whine and the fluid could barely reach the bottom of the dipstick so i bought some fluid and put way to much in it. puttin that much in it or passing the max line can that make it work harder and make the noise?
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Old Sep 16, 2010 | 01:30 PM
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If you have over filled it, just use a paper towel to soak up the difference, be careful not to drip the fluid on your paint. But if the power steering is squealing like a pig, it's typically low power steering fulid. Your local delaership will refill it as a courtesy to you, at no charge. I have had them refill my windshield washer fluid, engine coolant early this year.
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