M54 engine viscous fan. Not sure if I have an issue.

[Mint]

@Pond, if you do change the viscous coupling don't forget that the big nut is a left hand thread.

 

[Ianmc]

Why not delete the viscous fan, it doesn't seem to be needed? Or just leave as is.
Whilst no real comparison, my M44 only has the electric (aircon) fan and has no other fan installed from factory.