Question AIO rattling

[KacikCZ]

I‘ve owned the Corsair H150i Capellix XT AIO for about 1 week. When I turn on my PC after, for example, more than 8 hours of being off, I hear a rattling noise from the pump for about 3 seconds, then immediately stops and doesn't appear again, even if I turn off and on the PC, and sometimes it doesn't even happen after 8 hours. Should I be worried? Could it be because I have the radiator mounted on the front side? Here is a photo: https://ibb.co/BGZfcrg
The noise is like this:

View: https://youtu.be/gKkZ2E3oXz4

This is not my video, this guy has constant rattling noise but I have a similar noise.

 

[Aeacus]

Well, in the vid, the bloke says it's air bubbles trapped in the pump. And tilting the PC (to get the air moved to the rad) is solid "fix". Another option is ditching the AIO all-together and going with tower-type air cooler.

 

[Crosslhs82x2]

You could try removing rad and fans and someway prop the rad up so tubes are down or positioned as like top mounted.

Also watch this.

View: https://m.youtube.com/watch?v=BbGomv195sk&feature=youtu.be

 

[Dark Lord of Tech]

https://help.corsair.com/hc/en-us/articles/360045227371-How-to-Fix-rattling-or-bubbling-sounds-in-AIO-cooler

 

[Crosslhs82x2]

Keep us in the LOOP ( LOL )