Quiet high pitched noise from motor/ hochfrequentes Motorpfeifen

I hope english is ok

I've got a quiet high pitched (squeaking ? whistling ?) noise from the engine. I can hear it even sitting in the car.
This is present all the time, with no change in tone or frequency, regardless in idle or on the highway (harder to hear when driving due to normal driving noise)

I've been to the Opel garage, and the mechanic says "tankentluftungsventil", but looking through this forum, most of the complaints there are clicking noises.

Anyone else have this noise ?

P.S. You can reply in German, Ich verstehe Deutsch, It's just if I try to write in German, no one would understand

So I've uploaded two videos:

link -> outside the car, hood closed
link -> hood open, in the engine compartment

The sound is the high pitched "ringing" sound.

Thanks for the tip. But I’m not talking about the ticking or klacking sounds. I realize this is really loud in the videos.
I’m bothered by the high pitched noise. The best I can describe it is „quietschen“. It’s pretty quiet in the video. When I’m back home tomorrow, I’ll edit the audio to focus on the high pitched noise.

2018/02, Adam S. 1.4l Turbo 150ps

Hi! Hope the weekend is good for all

Here is a link to a sound file. I've filtered to the higher frequency range. The sound I'm trying to identify is the high pitched 'ringing' sound.

@Domi - That's the sound I'm talking about.

@GTdrifter - Wärmepumpe ? Have you had this problem with this sound before ?

Thanks for all the input. I'm just looking for something to go back to the dealer with. As I said before, the dealer mechanic just handwaved at the tankentluftungsventil and said it's normal. I'm not buying that. I have the feeling that they just don't want to take on any guarantee work