iMac (Late 2013) fan running very loud
I have recently bought a second-hand iMac (Late 2013) and the fan is running very loud.
The incidence and duration of this excessive fan noise is intermittent but nonetheless annoying.
Can anyone tell me if this is normal?
(Btw: I have run Apple Diagnostics and this came up as no problems found.)
Thanks.
iMac Line (2012 and Later)