Power steering is squealing at startup, sometimes it goes away after a few seconds, sometimes it doesn't. I could drive 10 miles and it will start squealing while sitting at a red light, goes away with acceleration.

So I found a used one and replaced it, same noise. Then I replaced the pressure switch in the hose, same noise. Fluid is topped off, belt is not too loose or too tight, tried it with different tensions.

Any ideas what else I should be looking for?

 

It sounded exactly like the power steering, but it was a slightly loose alternator belt...