Strange noise close to vacuum pump and other info

[vlad2004v]

Hello everyone.

I am trying to find out the source of a noise. There is a strange noise close to the vacuum pump, but seems not to be from it. I can hear it just on idle mode. Also, separate to this sound, on the left side of the engine, there is another sound, like a pump, but this is dissapearing when I accelerate.

For a better understanding, I have recorded a few seconds. Please see this video.

A a mention, it's a Citroen C5 2012, 2.0 HDi, RHH, 163 HP.



Thank you very much,
Vlad.