You know we can't hear this over a computer. You're going to have to search for this yourself. We can help with suggestions but we would have to have way more details or observations. Turning the steering wheel, turning off the heater fan, and driving at different speeds are good observations but they don't have anything in common. If you took the car to a mechanic, the first thing he would do is ask you a bunch of questions, just like a doctor would do if you told him you "don't feel well".
If the noise occurs only when you have the heater set to "defrost", you might be hearing the AC compressor clutch since the AC runs in defrost mode. A misaligned pulley will cause the belt to slide across it as it goes around it, and that will cause a miserable squeak. 1/16" misalignment is severe and no new belt will solve that. Turning the steering system puts added strain on the power steering pump and could cause a belt to squeal if it's loose. A weak or rusted-tight spring-loaded belt tensioner will let the belt squeal.
There is a tool you might be able to borrow or rent from an auto parts store that borrows them called the "Chassis Ear". It is a set of six microphones, a switch box, and headphones. You clip the microphones to suspect points, then drive around while listening with the headphones. You can move the microphones around to zero in on the source of the noise. Be aware that many mechanics have never seen or even heard of this tool. Suspension and alignment mechanics use it to find rattles, squeaks, and other noises.
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Friday, December 16th, 2011 AT 8:19 PM