New alternator time?

[xsara92]

I happened to notice a (quiet) axle-grinder type noise while test-revving my 1.6HDi 110, 2005 plate (while car was stationary).
Did some YouTube searching and I think the noise is very probably the aux belt tensioner. However, I had thought about replacing my alternator - it looks like it's been in the car since 2005, plenty of grease on it, BUT I so far haven't noticed any electrical symptoms at all - tried loading up with the lights, maxing the fan and A/C all at once, no sign of any gremlins. Car has done 100600 miles.
I've also seen previous threads where the alternator clutch pulley was the culprit behind the noisy belt tensioner. I assume the clutch pulley can't be replaced without taking out the alternator with this model (Xsara Picasso). But I might be wrong..
I could ask for an alternator replacement now but it seems a bit premature, but perhaps good prudence!
This seems like one to ask, what would you the Citroen owner do?

[Mihael_M]

Some mechanics have special headphones with which they can localize problem sounds. The alternator clutch is probably the cause. When replacing the clutch, the channel belt must be removed, and after that the alternator is easily removed. It is probably possible to replace the clutch without removing the alternator, but when the rest is removed, the alternator is easy to remove. It is better to mount the clutch on the removed alternator on the workbench than on the car where there is little space.When the alternator is outside it can be used to clean and blow it out with air.

[xsara92]

Thanks Michael for such a detailed explanation.
The garage I have booked (for a tensioner check) seem to be pretty accomplished in what they do, hopefully they are used to doing the things you mention.
I am also going to try to find out how old my alternator is, hopefully by deciphering the sticker on it to find out when it could have been manufactured. It's made by Valeo.