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You are either getting air into the system from a slight leak,the pump is bad or low on fluid more than likely.
Is the fluid nice and red,or is it dark and burnt smelling?
If it's dark and burnt then it's not lubricating the pump well enough probably.
That can cause the whine,and also cause the pump to go out.
Looking for signs of fluid weep around the pulley shaft,and on the rack itself.
Even if it's not wet with fluid,if fluid can get out then air can get in.
First thing I would try is changing the fluid if it's burnt/dirty and pulling a vacuum on it to pull out any air.
If that doesn't make it stop then more than likely your pump is failing.
Check for a leak in the lines and rack before you replace though-or you'll have the same issue in short time.
I've actually got the same issue on my wifes car-I've been neglecting messing with it though. I did suck all the fluid out and put fresh in but it came back pretty quick so I'm going to check for a leak and probably change the pump out under ext. warranty.
Not sure how much they cost,pump generally doesn't cost very much though.
Maybe capricewiz could pop up on this one since he's a GM technician. I think there was a TSB about the steering on these,don't remember it being related to the pump though. I think it was related to the shaft.
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