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What most people refer to as the "Ignition switch" is really the "cylinder lock", that when turned with the key, operates the actual "ignition switch".
The switch causing your problem is inside the steering column, and the column needs to be at least partly disassembled to access it.
The steering column shaft mounts to the rack and pinion steering gear with a type of u-joint and a pinch bolt to hold the steering column shaft tight on the rack and pinion stub shaft. This coupling may have gotten loosened, so you should check it. It is all hidden by the boot over the steering column on the floor. If you can get the boot to slide upward a bit, I think you can see the coupling. Or, you may need to look at it from underneath. The rack's stub shaft is on top of rack right where the steering column would come from the floor. Here's an idea: put the front up on jack stands or blocks. Then you could watch and listen while someone turns the steering wheel back and forth.
Sound like you may need a new power steering pump or rack and pinion. Have you noticed any leaks from the vehicle? If you've had the vehicle for 21yrs, then I would have to go with the power steering pump is begining to fail. Hope this helps.
If the squeeking is happening over bumps, and is not related to breaking, it could be a bearing in the steering linkage. My tahoe is doing the same thing, and my local garage says it is only a dealer fix. That is why I am searching this site now, is to find out if anyone else is complaining about this. I was told that GM is fully aware of this problem.