It sounds like a constant filling of a sink. that water dripping into water noise and its gets very loud under load
Any suggestions on what i should do to fix it?
Make sure that the pump is installed under the radiator/reservoir, so that air bubbles will not get stuck for long in it, but travel to the reservoir.
If that doesn't fix it, the liquid level in the system could be too low, but the H220 has a fill port, you could top off the reservoir level.
It is under and i think the liquid is low thank you a ton for the response.
Just make sure you don't use regular tap water. Use some good coolant, like Feser One. I'm not sure mixing different brands is a good idea, maybe bleed the entire thing and start fresh.