Power Steering Whine/Whirrrr??? - Page 2 - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #11 of 17 (permalink) Old 05-03-2011, 07:58 AM
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Join Date: Feb 2011
Posts: 15
So should I just look at adding a power steering cooler? I have a trans cooler in the garage and could see if I could hook it up inline.
Or try the valvoline Dex VI? I still think my problem might have been created with adding ATF after the conversion and it mixing with the power steering fluid.
Though I don't see how the trailer had much of effect on the power steering or brakes in my situation. I probably went over 100 miles without touching the brakes. No turns as just a little steering input on I45 between Dallas and Madisonville.
I'm headed to Barton Creek outside of Austin Thursday without the trailer so I'll see if it makes a difference and note the outside temps.
Again-I have no issues with the steering or brakes but only the whine from the pump.
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post #12 of 17 (permalink) Old 05-03-2011, 08:48 AM
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Location: College Station, Tx
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i had a leak somewhere and after changing all the power steering lines i found that it was the astual booster behing the master-cylinder. The fluids would get warm and the leak, eventhough the resevour was full, would caust the steering to whine and the pedal to almost pulse and vibrate

-Austin- Fightin' Texas Aggie
2001 LB7 2500HD CC/SB 2WD
Slower then a three wheeled Prius running on bio-diesel .
546hp & 1025 ft/lbs at Lone Star Dyno, Spring Branch Tx.
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post #13 of 17 (permalink) Old 05-03-2011, 10:31 PM Thread Starter
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Join Date: Jan 2011
Posts: 145
My brake pedal feels like it vibrates! I thought it was because of the diesel! maybe I have a leak, there are no obvious drips. Damn thing. I have been fighting the tough steering since I bought it, two days ago I find out that the 50 dollar bearing on the bottom of the steering shaft is hooped, replace it, now I have beautifully easy and smooth steering. I hope the whirr is as easy to fix, tomorrow I check for the leak!

2005 3500 SRW 4x4 lwb full load, up in the air a bit with 285 70 17 BFG All Terrains, 4 inch MBRP exhaust, and wrapped downpipe, AFE stage 2 and AFE MP, PPE Xcelerator Standard, egr deleted
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post #14 of 17 (permalink) Old 05-11-2011, 07:50 AM
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So my issue seems to be totaly dependent on the outside temperature and highway driving. Doesn't make the noise below 80 degrees. Doesn't matter if I am towing or not. Above 80 degrees and after driving awhile on the highway it will make a power steering noise on deceleration, braking, and steering wheel input. The pitch changes as I continue to press on the brakes until the noise finally stops which is before I slow to a complete stop.
I still have zero issue with the brakes or steering other than this noise. I still haven't found this power steering modification for flow? Something about a later model valve?

Anyone had to add a power steering cooler? This weekend I'm going to try and check all my hoses. I'm curious if one might be collapsing or something?
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post #15 of 17 (permalink) Old 05-11-2011, 04:51 PM
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Join Date: Oct 2010
Location: Colorado
Posts: 85
I added a PS cooler to my truck. I've cooked my fluid before and dont want to do it again this summer. I opted to get the non-existent stock dmax cooler (there is one) and it took about 20 minutes to install. The write ups are a bit old and miss a few things.

2005 Chevy 2500 DMAX Crew Cab Short Bed 4x4
AFE Mouthpiece, TXC Rad V2w/Fan, Mike-L's Trany Cooler, EGR Blocked, Diamond Eye DP,
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post #16 of 17 (permalink) Old 05-12-2011, 07:20 AM
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Good info. Since my truck is a suburban duramax conversion I doubt it has a stock cooler. I'll do some searching about a stock dmax cooler.
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post #17 of 17 (permalink) Old 06-27-2011, 09:01 AM
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Update-added a transmission cooler and it has almost solved my noise from the pump. Didn't do it at all on a 60 mile trip in 95-100 weather but was headed into a 25 mph wind. Trip before going with the wind it made a little noise using the brakes after 20 miles on the highway but not bad. Night/day difference. I"m going to flush the fluid one more time now that the cooler is on there and call it done.
Thanks for the help.
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