The fan makes a loud noise and vibration that increases with the fan speed. The first time I had it checked, the dealership replaced the blower motor under warranty. This did not fix the problem. Was told last week at another Nissan dealer that the fan needed cleaning as it was most likely an obstruction. On this model Rogue, it's a lengthy and expensive job as the fan is well hidden and hard to get to (behind the dash). Update to follow...