your appliance is fitted with a 32db turbo fan,its quite noisey until you get used to it,
However if the fan is making unusual noises then this could be a build up of ice around the fan.
pull the baskets out of the freezer compartment and on the rear wall you will see the fan,
look for ice around the fan and on the panel ,
as your model is a frost free version severe ice build up would suggest a problem with the evap circuit.
a way for removing the ice is with a hairdryer,but the problem will arise again quickly,.
Try a 48 hour defrost if you need too,remember to pull the mains plug ,open both doors and put pleanty towels on the floor around it.
paul, March 2012