Picked up my 172 today and once home and familiarising myself with it all I noticed a whirring/humming noise coming from the interior light when the ignition is turned on.
Whats up there?
Is it some kind of sensor for the climate control? There are two little speaker type areas in front and behind the light on the roof. The noise seems to be coming from the one nearest the windscreen. Sounds like a small fan that needs lubrication.