Sound coming from Vacuum/Oil pump? Or bad belt tensioner?

[LinasO]

Hello, after replacing timing belt with pulleys and coolant pump. I noticed this sound. I checked all of the plastic covers, the belt condition and everything seems fine.
Can a new tensioner be bad or is it the oil/vacuum pump?

I attach the video here.

 

 

[LinasO]

https://streamable.com/vox1vi


I attach a link for the video

[Bordeahhh]

Hello, also the same sound here after changing the timing belt and coolant pump. I noticed that this sound is only with the cold engine. After some time the sound dissappear. 

 

[Sid2020]

On 2/7/2025 at 1:07 PM, Bordeahhh said:

Hello, also the same sound here after changing the timing belt and coolant pump. I noticed that this sound is only with the cold engine. After some time the sound dissappear. 

 

I doesn’t allow me to view the original video or sound clip if a new one wants to be posted 

[raiz]

I got my 2.0TDI B9 quattro timing belt changed + the waterpump and when I got it back going uphill the car squeals its quiet unusual. 

[Sid2020]

Have you checked your serpentine belt as may be contaminated with antifreeze which would cause slippage under load. 

[raiz]

How do I check that?