Could be a belt screeching. Fan belt, A/C belt, Serpentine Belt, alternator belt, etc. Easiest way to isolate which belt is to open the hood and use your ears to see where the screeching is coming from. Left, right, front, behind the engine? Spray some WD-40 on the belt you think is making noise and if it quiets right away, then that is the belt making the noise. Either the tensioner needs adjusting or the belt needs replacing. The WD-40 does not hurt the car, it'll start screeching again in a few days when it wears off.
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