So... I had the same problem as well and fixed myself.
First, we need to open up the bottom cover of the glovebox. (10mm hex).
Second, look at the passenger door side - you'll find the fan motor housing.
(Picture here)
You need 3mm star driver to take three screws. (I luckily had that from Victorinox cyber tool).
The fan is cylinder type and it was making noise due to a small (a really small) leaf stuck inside of it. This relatively big leaf can go in there when there's an abrupt pressure change in the filter chamber. I had that pressure change when the AC was fully running and I changed that to window defogging.
Anyway... it's about 20min job so you don't need to bother yourself going to the dealer. Hope this helps.