Air-con Whine

[Anson]

Hi guys,

Have noticed this for awhile - When the car is stationary, in gear and the aircon is on, It's making this
low pitch whine noise...
Sounds like its coming from the air-con pulley.
Dose the bearing need replacing?

Heres a video-
http://youtu.be/-ERpgc-ZVUE

Thanks, Anson