[mytrplseven]

If it does go away then you need to check for bearing issues with the alternator, air conditioner compressor clutch or the power steering pump. Does the sound change when you turn the A/C on? If so that would be a clue. Do this first.

I'm also wondering what the serpentine and power steering belt tension is like. Sometimes if that or the power steering belt is loose or glazed it'll cause squealing problems. I'd look into this second.

If you've not isolated the issue by now, It could be just about anything. Water pump, alternator bearing, idler or sprockets bearings. The only way to find out for sure is to start with removing serpentine belt and power steering belt in succession to see if the sound goes away. If it doesn't then you know it's something inside the timing/balance belt area. At that point, I'd suggest you check your maintenance records to see when the water pump and belt rollers were last replaced. As a rule, the water pump is replaced every other belt replacement. The belts should be changed every 4 to 5 years and/or 30 to 40 thousand miles.