About the first sound m8,
I have the same problem for some time, it escalated a bit right after I had the thiming belt changed.
All pulleys, rolls and belts were changed, the only thing that remained is the alternator bearing (inner).
And it got louder because the new belt is a bit tighter so it makes a bit more tension on those bearings.
This is the way I have pinpointed the problem.
It also gets louder when warm, and the noise is a bit like scratching/whispernig/silent grinding.
if you are not sure, take a hose, cut it off to a meter, put your ear on one side, and the other side on the alternator - it helps to insulate the other noises present when tdi is runnig.
I have the same problem for some time, it escalated a bit right after I had the thiming belt changed.
All pulleys, rolls and belts were changed, the only thing that remained is the alternator bearing (inner).
And it got louder because the new belt is a bit tighter so it makes a bit more tension on those bearings.
This is the way I have pinpointed the problem.
It also gets louder when warm, and the noise is a bit like scratching/whispernig/silent grinding.
if you are not sure, take a hose, cut it off to a meter, put your ear on one side, and the other side on the alternator - it helps to insulate the other noises present when tdi is runnig.
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