Technical Ducato strange noise

[PaulEdennis]

Hi
I have recently replaced my alternator and am getting this noise that you can hear at the start of the video.
It happens when I first start the engine and then disappears but comes back again a minute later while the engine is ticking over.
Thanks

 

[jackwhoo]

On /off Hissing noise?

 

[jackwhoo]

If anyone else joins in it is the ford 2.2 engine

 

[PaulEdennis]

On /off Hissing noise?

No

 

[Mike1alike]

Which noise are you referring to?!
There are more than one noises that shouldn't be there.
Did you put a new belt after replacing the alternator?

 

[PaulEdennis]

Which noise are you referring to?!
There are more than one noises that shouldn't be there.
Did you put a new belt after replacing the alternator?

No

 

[Mike1alike]

Well...?!

 

[Mike1alike]

Why not?