Car makes loud groan when when I turn the steering wheel to the left. No noise when turned to the right. The front springs are new (struts are original), the stabilizer links are new, replaced 6 months ago. I replaced the lower ball joints on both sides 8 months ago (5,000 miles ago) and the noise went away for about a month, then came back same as before.
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First of all check the power steering fluid, have someone turn the wheel and listen to see if the noise is comming from the p/s pump, if no noise it is likely comming from the strut bearings. Worse case it could be in the rack & pinion unit.
I had this same problem and the dealer could not reproduce the noise when I would take it in to get looked at. (during the day when the temperature was warm) So I decided to leave it over night and they test drove it in the morning when the temperature was cold and they heard the noise. It ended up bing the steering rack.
You need to describe the problem better. Does it groan only when moving and turning, or will it make the same noise just sitting there turning the steering wheel. If it only makes noise when moving, that rules out a ps problem, the ps doesnt know if you are moving or not. Does it make different noise if you are going to the right or left, same noise, different? I dont know about the reservoir, some of them have filters, but I dont know if Buick does or not. If it was, it would cause a whine, not a groan.
The fluid in the versatrakAWD in the rear is old and needs to be drained and refilled. After you drain and refill it, make a bunch of sharp left and right hand turns, then drive it for 10 minutes. Drain and refill it for the second time and problem solved. Use only versatrak fluid available at any GM dealership. There is TSB on this now at the Buick dealership.
The groaning noise is the power steer pump operating under duress. I would suggest having the front suspension checked for any seized or failing ball joints or control arm problems. Most suspension guys will give the undercarriage a look over for you for free to check for any failing/unsafe parts. The engine belt driving the power steer pump should also be checked in case it needs adjustment.