If it is the suspension compressor, you can find out by turning off the air suspension switch in the trunk. if the noise goes away, that's it. they are very expensive, but a lot a people ride around with faulty air springs. just makes a lowrider
I would try changing the belt. It may be dry and cracked. It will cause whining/squealing sounds. It also will get tension when the steering is turned. It could still be the compressor bearings. The pulley on the compressor still turns when the compressor is off it just don't engage. but i would not change the compressor first.
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I never had this noise til recently and have owned the car for several years. From people I asked, was told that it sounded like compressor for suspension.
Firestone mechanic checked power steering fluid; pump etc and assured me that was not the problem.
I don't want to spend big $ unless I know it's worth fixing and will make the car (1995) worth keeping. I love this car!
power steering on fords are inherently loud. louder if fluid is low. check the fluid to make sure its at correct level on stick. take a long bladed screwdriver, touch metal end to ps pump (or a/c comp) put handle to you ear and it will act like a stethoscope (or use a real mechanics stethoscope) should be able to tell where the noise is coming from with that
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