Lack of power steering assist when cold - Hyundai Forums : Hyundai Forum
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post #1 of 9 (permalink) Old 11-10-2016, 10:52 AM Thread Starter
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Lack of power steering assist when cold

I will borrow a GM term that applied to many of their cars with rack and pinion steering in the 1980s: morning sickness.

With colder overnight and morning temps (high 30s/low 40s) upon us here in southeastern Pennsylvania the new-to-me 2007 Entourage has developed a new problem: morning sickness.

It caught me by surprise a couple of mornings ago when I was taking me kids to school. Got to the end of my street and started to make a sharp RH turn when *whoa* I seemed to lose power steering. It was bad and unexpected; I went partially into the oncoming traffic lane, making some new friends.

The problem seems to be here to stay with the colder weather and I need to do something about it pronto or my wife won't be able to drive the van.

Is this a known issue with these vans? If so, what is the preferred fix?

GM released a repair kit that included new lips seals for the control valve on the rack pinion. You had to pull the rack and remove the pinion shaft with seals, replace the seals, and reinstall the pinion shaft using a plastic guide tool that came (IIRC) with the kit. I'm wondering if Hyundai/KIA is doing the same thing.

This is a major pisser for me having just replaced the engine/trans/cradle in my van. I had to xfer my old rack to the new cradle and it seems that I xferred a rack with problems. Grrrr. No way to know it at the time, though, since ambient temps were easily 20F warmer then.


BTW fluid level is okay and there's no noise from the pump. I did lose some PS fluid during the drivetrain swap and refilled with the universal stuff we stock at the shop.

Oops. It just occurred to me to do a forum search on this issue. I'll do that now!

Last edited by Pete in PA; 11-10-2016 at 11:01 AM.
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post #2 of 9 (permalink) Old 12-04-2016, 10:56 AM
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My brother has a 2008 since new, has over 130k miles now.

I have done most of maint on vehicle so far; steering is fine in the cold. His young daughter even drives it.

Fluid was dump and filled once, with a Prestone universal fluid; any semi synthetic is fine. Fluid is based on transmission fluid like most other older cars.

The lower balljoints are the weakest part of the entourage front ends. Maybe something else else is sticking a bit in the cold;'upper strut mounts ? But as you know normally you get noise indicator of some sort , louder pump from load etc.

Any pump cavitation noise when assist was lost?
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post #3 of 9 (permalink) Old 12-04-2016, 04:17 PM Thread Starter
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There is brief cavitation noise on cold starts. Just a second or two and then it's gone. None during driving afterward.

The pump has some minor leaks at a few points and the high pressure hose from the pump is leaking through the hose walls a bit.
Therefore I'm going to replace the pump with a rebuilt part and buy a new hose asap. I was going to do it this weekend but forgot to order the parts from our supplier yesterday before they closed.

Looks like it'll happen this coming weekend. I'll gladly roll the dice and swap in a pump/hose if I have 50/50 odds of not having to replace the rack. Ug.
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post #4 of 9 (permalink) Old 12-04-2016, 04:34 PM
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I've done a few pumps on those. I'd caution against the reman ones as they (in my experience) don't seem to have the right o-ring (if any) behind the fitting for the Pressure hose.

OEM would be ideal, if it isn't cost prohibitive (usually the case).

Tips
-clean out the PS reservoir.
-any red (trans fluid, power steering fluid) fluid is ok here. No need for fancy/expensive fluids.
-take a closer look at the rack. I've seen multiple leaks from the end seals (no one services em anymore, so you'd be in for a new rack).
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post #5 of 9 (permalink) Old 12-04-2016, 05:27 PM
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I've always had good luck with Auto7 stuff from Rockauto ; its unofficial OEM stuff at a good price, in mobis bags.
Discount codes for 5% easily found on line.

Like OP mentions reservoir clean out important, I've since dirty screen in bottom create cavitation problem on a Hyundai.

Brake cleaner and compressed air fixed it. Changing rack, big awkward expensive job, even with a hoist.

I changed a mechanical rack on an EPS Elantra in summer; worm gear bushing play.
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post #6 of 9 (permalink) Old 12-04-2016, 05:59 PM
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Inspect crank pulley for ring to center hub seperation... as noted, complete fluid change with clean oil may be good idea also.

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post #7 of 9 (permalink) Old 12-12-2016, 02:46 PM Thread Starter
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Thanks for all the feedback; I think I have the problem licked. But first...

The shop I work at subscribes to a service called "Identifix." Basically it's a nationwide information sharing service that you access using a software package. You log on, enter make, model engine, etc. and then enter the trouble code you've found or a symptom. You then see dozens, sometimes hundreds of case histories of cars just like the one your're workign on with the exact same or very similar problem. System users can see what other shops tried and what eventually fixed the problem. So it's a very handy diagnosis tool, especially when you get a make/model car that you're unfamiliar with. It can be a huge time/money saver.

Well I entered all the info for my 07 Entourage and learned that poor power steering assist was not usually the pump or the rack -- it was the fluid reservoir. (As some responders pointed out.) Well there's a very fine mesh screen that separates the upper portion of the reservoir from the lower portion. Fluid returning from the rack/PS cooler is dumped into the reservoir but must then pass through the screen to enter the pump.

The screen may not be filthy and black or ever look clogged at all. But removing the reservoir, emptying it, and cleaning the screen with Brakleen or another solvent and then blowing the screen dry with compressed air is supposed to do the trick.

A lot of shops reported replacing the pump, (some did this twice), and then getting desperate and replacing the rack. Without fixing the problem!

At some point somebody discovered the reservoir screen issue and that did the trick.

Well last week we had a customer come in with about an 05 Amanti with lack of steering assist. Raising the car I could see that the pump had already been replaced and showed my boss. He said I guess it needs a rack. I convinced him to let me try the fluid reservoir cleanout trick since it was pretty easy and could be done from under the hood. He agreed and we were both amazed when cleaning that reservoir completely fixed the problem.

That had me pretty fired up and I was eager to try the fix on my van asap. I stayed late after work to try it and I'm sorry to say that it did absolutely nothing for me. Major bummer, let me tell you.

So Saturday I ordered a rebuilt pump and also a new Gates hose assembly. I went to the shop yesterday and replaced both of those parts and everything seems good now. I have to say that replacing that tiny pump is quite the bee-otch. Access is pretty nasty and getting at the top mounting bolt made me use my full swear word vocabulary.

It will all be worth it, though, if I leave for work tomorrow morning and full power steering function has been restored. It's supposed to drop to 25F tonight so I'll know one way or the other. LOL
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Last edited by Pete in PA; 12-12-2016 at 02:49 PM.
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post #8 of 9 (permalink) Old 12-29-2016, 04:15 PM Thread Starter
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It's been a couple of weeks and the poor assist problem hasn't reappeared. I'm pretty happy because I was *not* excited about replacing the rack.

Before our jobber picked up the old pump (core for rebuilding) I removed the cover plate to check out the rotor and vanes. Everything looked good in there. No scoring or obvious damage.

Let's hope that the problem is gone permanently and I can move onto other improvements. The first will be new front struts since, at almost 112k miles, they're shot.
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post #9 of 9 (permalink) Old 12-29-2016, 05:07 PM
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Glad you got it sorted out, nice clear pictures.

Northern cars with the salt and high moisture seems to add more work on older cars.

Just changed blower motor on entourage last week, actually pretty easy, four seasons aftermarket brand.

Weirdest problem I have seen on the van was Passenger side c/v. It is a two section unit, different than most vehicles. Gave a funny noise and vibration at 35-50 mph. Had to change outer double universal section only, regular fairly cheap part, boots showed no wear.
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