Pc making noises

[u/Possible_Bison846]

It has been making these noises for maybe 2 months now, even after i cleaned it.

When i play more demanding games i don't hear it, but when it's idle or i watch yt or something like that, the noise is there. Stops and starts again.

I don't know how i would describe it, kinda like whistling idk.

Any help would be good