AUX Belt tensioner or belt maybe ?
Tensioner as it will start to screech when the knackered bearings have started to overheat.
If it is that fix urgently far too many horror stories of the belt going & taking out the cambelt at the same time.
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Current 2015 XC60 D5 AWD - Caspian Blue
Previous 2012 XC60 D5 AWD - Seashell Metallic
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Previous 1999 S40 XS - Silver
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