Question Noisy watercooler

[spicyyy777]

I have a cooler master masterliquid ml120r rgb cpu cooler. The problem is that recently the cooler has been making lots of watery , splooshing sounds.
This is my first liquid cooled pc so Im not sure if this is normal or not. My cpu is an i5-9600K (not OCed) and my idle Temps seem fine at 34-35ºC and my temps while on load are 48ºC.
Thus the temps look fine to me so my actual question is if the watery sounds from the cooler is something bad or is it normal , and the sounds occur that often but , when it does it sounds like a fishtank.

 

[R_1]

like bubbles?
could be evaporation of the coolant, how old is the cooler? unlikely if new but that is what the warranty is for.
air bubbles around the pump can decrease pumping and make some noise.

 

[spicyyy777]

like bubbles?
could be evaporation of the coolant, how old is the cooler? unlikely if new but that is what the warranty is for.
air bubbles around the pump can decrease pumping and make some noise, it has to be the pump its the only moving part.

yes its the pump and the cooler is relatively new

 

[R_1]

is the radiator mounted below or above the cooler and pump?
bubbles will accumulate at the highest point in the system and if the pump is higher than the radiator that is where they will stay.
other CM owners report that running the unit at full for a while may help, if full does not work try the slowest speed, cavitation may be trapping the bubbles.
I do not have one but maybe a call to CM support could answer better.