| slotted vent in HVAC dash unit?
Im a bit confused.
On the passenger side of the dash HVAC unit, above the all off button, there is a slotted grille vent.
There is a noise emanating from this grille unit. A sort of rattling/buzzing. I was under the impression that this was the sampling fan for the climate control. Now Im reading that this sampling fan is up by the rearview mirror.
So, long story short, if it isn't the sampling fan, what is behind that slotted grille?
Thanks | 
