Power steering belt, I'll bet.
A few months back I bought a set of genuine Honda OEM belts. These are
smooth, without the 'toothy' inner surface that many aftermarket lines
display. Those things squealed like a stuck pig every time I started
the car with a depleted power steering reservoir. If I tightened them
enough, they'd finally stop squeaking, but the tension required seemed
excessive. Since the old belts were looking pretty good they went back
on and the 'squealers' went into the trunk as spares.
Feel your alternator pulley next time you take a short drive. If it's
hot, the belt is slipping. Something to avoid.
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