Power Steering issues

Hi there, I have a 97 850 with 182k km. Lately, I've been getting an ugly whirring sound when I have to do more than a 60 degree turn. How
is the power steering taken care of on this car? Could this be a bad pully/tensioner or something? I also have a pretty bad steering wheel shake that I drive in and out of after hitting a snow bank a few months back. I thought it was the tires being unbalanced, so had them balanced but its still there - could these two issues be related? The car drives perfectly straight, but the steering wheel wobbles back and forth. Any help is appreciated.
Thanks Ben
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I suspect 2 separate problems.
I have a '97 850 wagon with 110K on it and had noises but pulsing in the wheel when I made hard turns. After inspecting, I found slight leakage on the rack, so I replaced and the problem was gone.
On your wheel shimmy, if you feel it in the steering wheel that's good indicator it's in the front end. Who did your wheel balance? You might just swap the tires front to back and see if the shimmy moves from being felt in the wheel to being felt in the floor or your seat, then it was probably still a wheel balance problem (eg out of balance, bent wheel, etc).
If that doesn't fix it, given your attack by a wayward snow bank, I'd also be suspicous about the front end and have a good front end man check it out.

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Thanks for the reply, I'll switch the tires around and see if that takes care of it. I'm 99% sure that if it were a wheel balance/bent rim issue, that its the front left tire. I got the balancing done at crappy tire here in canada, I didn't think that it'd be possible to screw up something as trivial as wheel balancing.. Hopefully I'm mistaken, and it turns out they're just morons that can't balance a wheel.. I'd much rather be out the $50 for the crappy balance job (did all 4 wheels) than to find out I completely wrecked my front end!
Thanks Ben
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