First guess since you said "screetching". Can you safely rev the engine from the front of the car(hood up of coarse). This way you can hone in on the area of screetch. My guess would be loose fan belt. Or power steering belt. If not, while revving, see if the engine tilts alot to one side. That would be a broken or worn motor mount causing the fan itself to rub on the fand shroud.

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