Humming/Buzzing noise

[e82hud]

I have a low tone buzzing noise that occurs while at idle whether cold or warm, every 5 seconds it starts making the low tone buzz for 2-3 seconds. (from what i’ve read it could be a issue with the water pump or ecu fanbox) The car runs and drives fine, doesn’t overheat. The noise started after I got my motor replaced at a shop (Motor is at 160k km, car is at 167k km)

^goes away under load, only at idle

[mySlow1]

If it's only at idle you can pop the hood. Where is the sound coming from? Maybe record it and share?

[e82hud]

put my old water pump in & noise didn’t go away, pretty sure it’s my boost solenoid after doing more research, don’t have any issues and apparently it can make that noise and be fine, just another weird bmw thing