I'm trying to find out the cause of grinding noise that comes from engine bay while I turn on Aircon on my 2005 ford focus MK2 1.6 auto Zetec climate. Aircon works fine. Howevere I can hear the grinding noise from inside the car and the noise increases and decreases with the engine rev and speed, any idea what could be the cause of the issue?
Could it be the AC clutch? If yes how can I replace it?
Could it be a bad bearing as the noise is grinding noise like this one below http://www.youtube.com/watch?v=IDykOdcwTDc&feature=related
Thanks in advance!