Hello there, 1 month ago I started having some issues with a whining noise, might be belt or alternator. A very,, experienced mechanic,, told me that it might be because the engine vibrates and causes the belt to stretch ��.
Here's a video of the exact noise (not my video)

https://youtu.be/QzSgOr6CSgA

That "whining"-like noise is present in many different cars (makers, models). It doesn't have to be "bad" thing just because it's there (question is, how much is too much for particular engine).
Maybe it's an auxiliary tensioner, alternator, AC, or worst (timing belt tensioner or water pump).

Easy test (should be done by the "experienced mechanic"!): drop the alternator belt and start the car for a minute or two (not longer, it may overheat the alternator rotor).

I can hear there another layer of noise, like "growling" ("gargling"), "rumbling" while revving up. That sounds more worrying, sounds like engine (inside) or gearbox rattling. Or bad exhaust...or combination (a bit of everything).

There I was looking forward to hearing Alesi/Berger in a V12..

There are MANY sounds under the bonnet..

Firstly..with a COLD unused engine

Check the fluid levels -3 including clutch

Then give the alternator drive belt a tug/wriggle

Then get a hand on the TOP of engine Metalwork.. not airbox..

Give it a shove back and forth , it might move a little.. but should be silent.. clonk noises mean it is hitting something

Thank you all for your replies. I've managed to take a video of my car, the whining noise goes up with the acceletation
https://vimeo.com/406023571

For that sound, list is always the same for most cars in the world (number 1 most feasible):
1. Alternator bearings.
2. Or tensioner (alternator/AirCon.) bearing.
3. Air conditioning compressor bearings.
4. Timing belt tensioner bearings.
5. Water pump bearings.
6. Engine.
7. Clutch (bearing).
8. Gearbox (bearings, gears).

Now what? You've wasted one week (or more). Drop the alternator belt and check if noise goes away.
BTW, check also if you have old style, improper water drain (short one, so rain water is pouring straight onto the alternator).
New, improved one (longer): https://www.google.com/search?q=fiat+part+51810013

GrandePunto PL said:

For that sound, list is always the same for most cars in the world (number 1 most feasible):
1. Alternator bearings.
2. Or tensioner (alternator/AirCon.) bearing.
3. Air conditioning compressor bearings.
4. Timing belt tensioner bearings.
5. Water pump bearings.
6. Engine.
7. Clutch (bearing).
8. Gearbox (bearings, gears).

Now what? You've wasted one week (or more). Drop the alternator belt and check if noise goes away.
BTW, check also if you have old style, improper water drain (short one, so rain water is pouring straight onto the alternator).
New, improved one (longer): https://www.google.com/search?q=fiat+part+51810013

Click to expand...

Thank you sir, I will drop the belt today and see what I come up with

Couple of things you can do before pulling it apart.

Does the noise go if you push the clutch down? If yes then it’s likely to be the gearbox if it gets worse then it’s likely to be the clutch release bearing (it’s not the clutch bearing)

Turn off the aircon if the noise goes away then it’s the aircon (it’s not the aircon)


The problem with just taking the belt off, is if the noise goes away it doesn’t tell you what was causing it, if the noise doesn’t go away it still doesn’t tell you what is causing it.

Really you need to have a listen under the bonnet and see if you can work out where the noise is coming from.

The old mechanics trick of a long screwdriver with the tip against or near the suspect part and the handle to you ear (like a make shift stethoscope) was the usual way of locating weird noises. These days a mechanic would use a mechanics stethoscope which is like a doctors one but a metal probe instead of a bell