Air con pulley?

collieno

Petrolheads
Are these common to go on classics? Are they easy changed? I have started to notice a whining noise from the pulley on the top right when you are looking at the pulley set up at the front of the engine. As far as i can tell its the air con pulley. IS it doing more damage driving it like that? Are they easy fixed????
 
the only way to tell is to remove the aircon belt, it could also be comming from the tensioner pulley which afaik is a more common problem then the aircon pulley itself.
when trying to find the whine on my car which turned out to be the altenator i disconnected the aircon and the tensioner and even though it wasnt the cause of the whine there was a noticable differance in the noise levels comming from the engine and in my case its the tensioner pulley making most of the noise.
 
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