I would reckon a new pump. I had this recently on my Jag XKR. The pulley on that was on some magnetic clutch and I just purchased a good second hand unit.
Remove the belt and see if there is any play in the pulley.
 
The other option if buying a replacement is too costly is to replace the aircon pump with a non aircon idler pulley and belt.
 
No it's not the belt looking at the aircon pump the clutch isn't working and with belt off the pump is very hard to move and not smooth
 
darrenm said:
No it's not the belt looking at the aircon pump the clutch isn't working and with belt off the pump is very hard to move and not smooth
Click to expand...

it should spin freely when disengaged and lock up when engaged. It does sound like it's knackered. If you wait until dark and then start the engine up with the belt on you may even see some sparks from it.
 
Pump off and checked then put back on and regased and still making noise
My mate who does aircon is saying it's not the pump
 
darrenm said:
Pump off and checked then put back on and regased and still making noise
My mate who does aircon is saying it's not the pump
Click to expand...

take the belt back off and feel for roughness in the other pulleys. Pay particular attention to the idler and tensioner pulleys.
 
the alternator is not alone there the vacuum pump is attached and IMO that's fubar'd...but afaik it will not spin freely due to the pump even if it's good...and if it doesnt spin with the belt you'll get a "no charging" warning on the dash...unfortunately you can't buy just the pump as a spare:mad:...shame
 
Seems odd as when aircon starts up there is Deffo a rattle from aircon pump / pulley but there still is a whistle from somewhere
 
Sorted found a manifold stud that had become wedged against pulley so it's manifold stud replacing time again
 
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