Air-con compressor clutch pulley

[Jackie Joy]

AU air con pump, clutch & pulley - yeah (I know this is in reply to over 6 years ago, but there may be others with the same problem) - My AU started to cut out on idle, with a tinny shuddering noise. I thought it might be the cheap 7-11 petrol, but it turned out that when I switched off the air con the problem stopped. Luckily there was smoke coming out of the air con clutch, so I started looking there. Nothing worse than not knowing what the problem is. Obvious things like smoke, fire, rattles, things falling off absolutely welcome as diagnostic aids! Anyway no problem as long as the air con off. I tried to turn the front of the air con pump by hand (that's the part that stays at rest when the clutch is off) and it seemed really seized up. Don't know how that can happen. Anybody else come across a seized up air con pump?