powerstering issues?
If they are leaking, you'll get coolant in the PS fluid and PS fluid in the cooling system.
Coolant is pretty much an anti-lubricant, which would explain why the pumps keep failing. I'd check that out first.
Is it possible for metal to contaminate the PS system?
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And if the new PS pulley is a different size, the belt is too tight or too loose, causing it to "pull" the pulley, or "slip" on the pulley; which is probably causing the squealing. If you have some belt dressing, spray some on that pulley just to see if it stops the noise - before you go buying belts and what not.
The only thing I can say is if the belt's tight like you said, you may have it routed wrong OR it's the wrong size belt. I really don't believe your PS pump is bad. It HAS to be a belt issue because it's squealing, not whining.




