Aircon/Blower rattle

Since i've owned my 200 it's had a weird rattle. It happens when the Blower is on. But only at certain speeds. The rattle is a very quiet tick noise. Sometimes it happens only on the lowest speed, and you can make it go away by going to the next speed up. But sometimes it rattles on any speed unless you turn it off. It's pretty frustrating.

Any ideas what it could be? A bearing on the fan? It seems to happen on any air direction too (screen, face, feet etc..)

Cheers!
 
Clean the area behind the pollen filter with a hoover. Renault don't do this when replacing the filter, so it gets full of debris.
 
usually a dry dead leaf that causes that issue.
remove the pollen filter from behind the dash and vacuum(hoover) what ever excess dirt and leaves are left there.
good idea to change the filter if its too dirty.