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A whinning noise while turning is an indication of a worn bearing. The extra pressure put against the bearing/race during the turn and the closing of a gap creates this noise.I would chech the axle bearings on the side of the truck on the outside the curve when you hear it. What I'm saying is if you hear it when you turn left....check the right side bearing
You have a leak in the power steering system. It should be easy to find just look for where the fluid is dropping onto the ground below the vehicle while parked, then look under the vehicle to see where the leak is coming from. Make repairs as needed.
are you sure the noise is comming from pump and not the belt tension pulley right next to it ?
I use a wiffle ball bat with both end caps cut off (hollow tube) held to my ear to help localize noises on running engines I have even found tricky intake vac leaks with that trick
the fluid could be burnt and the filter may need to change. You would aslo need to check the air in your tires to see if one of the front tires is low on air, then the next thing would be to check to see if a brake caliper is sticking.
Bearing going out on alt, power steering, AC, ect. put a long screw driver to your ear them the sharp end on each unit to listen for the sounds it makes.
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