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If the a/c compressor is seized, the p/s pump drive will be OK as long as the a/c clutch remains disengaged. That allows that pulley to spin without connection to the a/c compressor rotor. If the clutch is "iffy", tht MIGHT be the problem.
Another source could be the harmonic balancer. As they fail (I have on, too) the outer drive pulley begins to slip on the rubber ring. Makes a very audible squeal. Things that change the load on the addessory drive belts can affest the squeal.
Alternator load is high right after a cold or long start, since it is working harder to replace the charge. That's especially true if you start and immediately turn on electric loads, like headlights, rear window demist, heater blower, seat heaters, etc.
Low speed sharp turns raise the p/s pump load.
You might be able to determine if the noise is a failing balancer by veying the load.
Check the alignment of the alternator and a/c compressor belts, too. Look from the side, engine off or on. The pulley must be in the same plane as the belt. Accessory bushings get worn and flattened over time, allowing the p/s pump or alternator to get out of line. Belt dressing is a short term patch.
Good Luck,
Bob
:>)
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