SOURCE: Noise when I turn my steering wheel.
If there is fluid in the pump and it makes noise, that may indicate that the pump is going bad. Some PS pumps just make noise. Ford pumps, for example make a lot of noise, and there is nothing wrong with them. If it's a squeal, it might mean the bearings in the pump are going bad.
SOURCE: 03 Windstar makes a whining noise when idling and
When you checked the power steering fluid level were there any indications of excessive foaming? There are three things that would cause a whining noise from the power steering. 1- low fluid (you checked that so that is not the culprit), 2- loose steering drive belt (you should not be able to press down on the belt more that about one inch between the steering pump pulley and the crankshaft pulley), 3- power steering pump bearing worn out.
SOURCE: power steering fluid levels in 03
Its located next to the windscreen wash bottle on the front right of engine bay, unscrew the cap which is also the dipstick and wipe it clean.Put the cap back into the bottle but dont screw in just dunk it flush with the bottle and lift off and the fluid should be on the high mark on dipstick or if you prefer, just remove the black plastic cover and you will see the container and high mark(min/max).If you want to change the fluid just use a syringe(no needle) and **** all the fluid out(leave a layer on the bottom) and pour in fresh fluid.I did this on 3 weekends so eachtime i sucked out most of the old fluid and the system should only need this every 2 years and last much longer.Keep dirt and dust out and clean around any surfaces before removing the cap etc.
CAUTION: If using a prying device to assist in water pump removal, be careful not to damage the mating surfaces. CAUTION: This engine has aluminum cylinder heads (6049) and requires a special corrosion inhibiting coolant to avoid cooling system damage. Refer to Section 03-03 for the coolant specifications. 
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