Erwin,
This may be no help since I have a 99 V70, but mine does have some sort of a clutch associated with the alternator pulley, so that could be an issue with yours.
My alt is not behind the intake manifold, but I had to replace it recently, and it required removing the power steering pump and reservoir and loosening the AC compressor just to get alt out of the car.
I suggest that it is enough work to replace the alt, that it is likely not to be worth trying to fix it rather than just replacing it with a recon unit. Even on mine, I would not want to do it twice.
Good Luck,
Charley
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