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Discussion Starter #1 (Edited)
Hi,

I've searched on this issue but am having no luck identifying the problem. It usually occurs after prolonged highway driving and is loudest at that time. Tends to calm down if driving around town but I've noticed it is there with city driving at reduced sound levels. Car has 98K on it, original owner, and noticed this first happening quite a while ago but only very intermittently and only after long highway drives.

Please listen to the video and let me know if anyone's experienced this.

Thanks!

https://youtu.be/2k5V7U8cy9w
 

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Sounds exactly like the problem I had when I would hear loud whining at the first stop light after coming off a long highway drive. Turned out to be that common power steering pump o-ring leak which leaked air into the power steering system. After a long drive, look inside the power steering fluid reservoir for air bubbles.
 

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i was going to say the same...PS pump related almost def. put it in netural and observe the whine as you vary the rpm. if it fluctuates w the rpm its from a belt driven component likely.
 

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Discussion Starter #4
thanks guys. haven't checked the reservoir after a drive yet but can definitely confirm that it does fluctuate with rpms. Is the o-ring fix just a cheap repair or do you need a new pump?

Coincidentally this weekend, had a misfire in cylinder 4 and the out of town dealer changed out all the plugs since I'm so close to the replacement interval. All's good now, but they did say the wheel was harder to turn at low speeds and gave us a copy of a TSB extending the warranty on the PS pump, which technically expired for me back in August!
 

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Just had the same issue on a 2008. In the morning, all was quiet. 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mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} </style> <![endif]--> and their are bubbles. Changed the o-ring, which is simple to do (about 10 minutes), bled the system by turning wheel back and forth with the front of car slightly jacked up, but the bubbles would return for the next week of driving. This seems to fix it for most, but it did not for me.

I then removed the PS reservoir and found that there is a built in filter at the bottom. Ran some brake cleaner through the bottle and dumped it out. Hooked everything back up and it works as expected; no more whine. My theory is that the filter was clogged and not allowing enough fluid into the pump, causing cavitation and aerating the fluid. Its been a few days now and all is good.
 

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Discussion Starter #6
Just to close this thread out, it was the PS pump itself. It was internal bearings that made more noise as the internals heated up, thus the noise showing up after longer drives. They were able to replicate the noise in the video then swapped it out and all's good now.

Thanks all.
 
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