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  #1  
Old 03-27-2007, 11:25 PM
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Air in the power steering fluid?

I had a post a few days ago, about a low noise, typically on the first start of the day when backing straight out of my driveway. When I turn the wheel a bit, there will be a low huuuuuuuh kind of a sound. It might do it one more time, then is pretty much ok all day, might do it once during the day after a warm start.

Someone wrote to my other post, that it could be air in the power steering pump, to jack it up, turn the wheels all the way left and right a few times to get the air out. I don't know how air could get it, seems like it'd bubble right to the top of the fluid. Not to disbelieve who wrote that, but he was the only one who replied back. Was just trying to see if anyone else concurred or had any ideas. My neighbor said maybe the PS pump is starting to go.

Thanks,

Jeff 1991 300d, 103k

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  #2  
Old 03-27-2007, 11:26 PM
300SD81's Avatar
1981 Mercedes-Benz 300SD
 
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Never experienced that, flushed my PS pump twice, letting it get completely dry, seems to me at the volume that thing pumps, no air coould stay in it or the lines once its filled up with fluid.
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  #3  
Old 03-28-2007, 12:25 AM
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Air can't stay in the lines, but it could stay in the box. It definitely will stay in the rack of a newer car, and circulate with the fluid as tiny bubbles. I had that problem with mine.
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  #4  
Old 03-28-2007, 07:13 AM
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The only time I had noise coming from my PS system, it was due to low PS fluid levels in the system.

Once I added a little more to the reservoir, it quit making the noise.

I'm assuming that it blew all the bubbles back up to the reservoir, but I can't swear to that.
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  #5  
Old 03-28-2007, 07:17 AM
LarryBible
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Just make sure that the reservoir is filled and then turn the steering wheel back and forth with the engine running. After turning back and forth for about 5 or 10 turns. Kill the engine and make sure the reservoir is full. It will show some bubbles at that point, but just see that the res is full and drive it. There is no need to jack up the front.
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  #6  
Old 03-28-2007, 11:19 AM
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Bad for the tires

Quote:
Originally Posted by LarryBible View Post
Just make sure that the reservoir is filled and then turn the steering wheel back and forth with the engine running. After turning back and forth for about 5 or 10 turns. Kill the engine and make sure the reservoir is full. It will show some bubbles at that point, but just see that the res is full and drive it. There is no need to jack up the front.
I had to get some new tires recently, got the Michelin MXV IV's. The guy said what kills tires is all the turning. I thought it was high highway speeds, but he said the turning and grinding on pavement grinds the rubber. I'll try this on a rainy day in the mud, will prevent me from having to jack the car up or grinding my new tires down!

Thanks,

jeff
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  #7  
Old 03-28-2007, 11:30 AM
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mmmmmm Diesel...
 
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Quote:
Originally Posted by jbach36 View Post
I had to get some new tires recently, got the Michelin MXV IV's. The guy said what kills tires is all the turning. I thought it was high highway speeds, but he said the turning and grinding on pavement grinds the rubber. I'll try this on a rainy day in the mud, will prevent me from having to jack the car up or grinding my new tires down!

Thanks,

jeff
It also causes stress and wear on the steering components. Rasing the car up a bit relieves the stress and is much cleaner that waiting for rain induced mud. You can also idle the engine is an empty parking lot, have the car in gear and do the same procedure while the car is rolling.
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  #8  
Old 03-29-2007, 06:57 AM
LarryBible
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Yes and make sure that you sweep the shop floor first so that the tires don't get dirty.
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  #9  
Old 03-29-2007, 08:10 AM
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Quote:
Originally Posted by LarryBible View Post
Yes and make sure that you sweep the shop floor first so that the tires don't get dirty.
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  #10  
Old 03-29-2007, 05:50 PM
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The system is effectively self bleeding, If the fluid is @ the correct level, there should be little to no foam in the reservoir after a day of driving, Perhaps your fluid is compromised (water or some other substance), Power steering fluid shoud be clear, if its not, flush it. They usually hum when they are low on fluid.
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  #11  
Old 03-29-2007, 05:55 PM
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mmmmmm Diesel...
 
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A clogged filter will also rob the pump of oil, resulting in humming, and eventual failure.

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70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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