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Unread 11-23-2014, 12:29 PM   #1
mdrum93
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Power steering problem

So my brother has an 04 WJ 4.7 and has recently gotten the power steering pump replaced with a new one by a trusted family mechanic and it was working perfectly for about a week. At that point it would immediately make a terribly loud whine at idle after start up, and now won't stop doing it. We checked the fluid multiple times and each time it is a milky chocolate color, which I have come to learn it means water in the oil. So we called the mechanic (who is 2 hours away in our hometown..were in college) and he said to flush it 2 or 3 times with some fresh power steering fluid. My brother went to advance and came back with ATF-4 saying the employee recommended it over normal fluid since it was a jeep for some reason, I wasn't there.

But anyways, we have flushed it twice with the ATF-4 and the problem still persists. I was wanting to see if anyone has had a similar experience so maybe we could fix this ourselves before we have to figure out a way to get his jeep back home over thanksgiving break. I would like to avoid driving anywhere it sounds way too bad.

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Unread 11-23-2014, 02:39 PM   #2
snobrdrkid07
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You can not use ATF+4 in the WJ power steering system. Especially with the hydro-fan

From WJ Jeeps:

Quote:
Mopar®P/N 04883077 Hydraulic fluid / Power steering fluid (MS5931)
MS5931 IS THE ONLY FLUID THAT CAN BE USED FOR THE POWER STEERING SYSTEM. NO EXCEPTIONS!

Important note:
The factory fill power steering fluid for all 1999-2004 Grand Cherokees is a unique fluid, MS5931. ATF+4 (MS9602) should not be mixed or used as a “topping off” fluid on the Grand Cherokee WJ. All WJ models should be serviced using ONLY the special MS5931 fluid. ATF+4 is NOT an approved Power Steering Fluid and should never be used under any circumstances. Note that all fluids will darken in color with usage and fluid color is no longer an indication of fluid condition.
Also sounds like you've got a bad pump or air in the system. Air will make it scream and bubble up.
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Unread 11-23-2014, 06:10 PM   #3
99SK04GTX
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Buy Valvoline Power steering fluid in the blue and white bottle, Advance sells it and it meets MS5931. http://shop.advanceautoparts.com/p/v...+stering+fluid . $16.99 for a gallon; order online and use code TRT30 for 30 off and pick up at the store = $11.90 for a gallon. Buy a $1 turkey baster and flush


And make Advance give you credit for that expensive ATF+4 they steered you to

Last edited by 99SK04GTX; 11-23-2014 at 06:21 PM.. Reason: add
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Unread 11-23-2014, 07:00 PM   #4
86cj74.2L
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Jack the front up in the air and turn wheels lock to lock and push the air out of the system. Do it 10 times then let the bubbles settle and repeat until just a few bubbles or no bubbles and then start engine and repeat the lock to lock thing.
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Unread 11-24-2014, 01:49 AM   #5
Frambo
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Quote:
Originally Posted by 86cj74.2L View Post
Jack the front up in the air and turn wheels lock to lock and push the air out of the system. Do it 10 times then let the bubbles settle and repeat until just a few bubbles or no bubbles and then start engine and repeat the lock to lock thing.
This, but when I did it I had the cap off to reduce pressure and facilitate the air's escape
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Unread 11-24-2014, 04:00 AM   #6
86cj74.2L
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Quote:
Originally Posted by Frambo
This, but when I did it I had the cap off to reduce pressure and facilitate the air's escape
Me too.
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