As Peter says, its a seized nose bearing in the AC pump that is now spinning in the housing so its not repairable.
Also, dont bother with used. Any pump that has been removed and open to the elements for only a day will seize internally.
Your best bet is an aftermarket one that can be had for around £250:
https://www.autoairconparts.co.uk/c...matic-may-2002-to-nov-2007-part-14-2074p.html
If left, and Peter will testify, the whole unit will seize and take your Aux belt off rendering the car underivable.
Fitting is a bit of a pig so factor in a specialist labour charge of a similar cost to the pump above.