Steering noise from 2002 Mondeo?

Can anyone help me identifying the possible cause of a noise coming from the steering of my 2002 2.0L Mondeo zetec.When the steering wheel is turned i get a strange whistling/whoosing type sound - not too loud but noticable.Any help would be appreciated.
steve barrett, April 2005


done
i would check my power steering fluid bottle as i had the same problem,my fluid level was down by only a small amount,once back to the correct level everything ok

john, April 2005
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