[SOLVED] CoolerMaster ML240L V2

[DeanTH23]

Ryzen 5 3600 4.200 all cores 1.32V LLC Lvl 5
Asus X570 TUF

I installed this AIO 4 days ago.

For the first 2 days everything was normal but since yesterday when the system idles, i can hear a weird noise coming from the cooler...Only when idles.

I never had an AIO before so i have no idea what this sound can be.
Since it doesn't happen on load i don't think that it's a broken thing inside the loop, either air bubbles or a faulty fan.
Temps are normal.
35-50 idle (they flactuate when idle, it did happen with an air cooler aswell so it's not an aio issue)
70-72 load cinebench r20

Any ideas? Thank you.

 

[DeanTH23]

Also i forgot to mention that pump speed is steady according to monitoring programs and the BIOS, at 2300 RPM