Question Weird buzzing noise coming from case fan that goes away when I hit it

[AWN3ST]

So there's a buzzing noise coming from my PC that I'm positive is coming from my back case fan that is connected to my liquid cooling filter. It's a really old fan, like 5 years old. Anyways here is a video demonstrating what is happening and the sound keeps coming back after like 10 minutes

https://twitter.com/x/status/1134379518406402048

View: https://twitter.com/AWN3ST/status/1134379518406402048

 

[DMAN999]

So why Not replace the fan and see if that noise goes away ?
Fans aren't very expensive and easy to replace.
Alternatively just taking the fan out and cleaning it may fix the issue.

 

[USAFRet]

Sounds like something is not screwed down tight enough.