In most cases you can purchase the bearing and pulley as an assembly from your local auto parts store.
it is time to change bearing on that pulley
That pulley has a bearing on the inside of it that has gone bad. Replace the pulley with a new 1
Most likely a bad bearing on compressor pulley.
Put on a new pulley bearing.
Take off belt, remove bolt in center of pulley, replace with new pulley (comes with bearing). Reverse to install Take off belt, remove bolt in center of pulley, replace with new pulley (comes with bearing).
Yes, the bearing in that pulley may be going bad.
They are loose or worn out. Also can be a pulley with a bad bearing.
Assuming your serpentine belt is in good condition... the bearing of pulley could be making noise (or bearing could fail allowing you to jiggle pulley with your hand), and/or tensioner spring is worn out.
If you're describing the idler pulley or the tensioner pulley, it's probably a bad bearing. Pulley bearing failure is common and relatively easy to repair. Remove tension from the serpentine belt then turn the pulley back and forth with your fingers. It should make no noticable noise and should turn smoothly. If you can hear any grinding noise or if the pulley feels like the bearing is grinding, replace it.
you probably have a bad bearing
An accessory drive belt idler pulley bearing going bad.
You cannot change the compressor bearing, however, you can change the clutch bearing. Which one is bad? Is there a noise when the clutch is engaged, or not engaged?