Whirring sound from inside car when A/C is on

[hubbyaris]

Hi,
My wife's Yaris started to make a whirring sound when the a/c is turned on. The source of the sound seems to come from under the main glovebox. Near where the fuse box is located. It is audible from outside too near the vent intake. It does not seem to emanate from the engine bay. However, according to my wife, the air that comes out does not seem to be either warm or cold, so I guess ambient temp.

Can someone please shed some light as to what could possibly be wrong with it?

Also, would one know if this should be covered under the 3 year warranty guarantee? The car is 2.5yrs old and have done 35,000 kms (roughly 22,000 miles)

Many thanks for your anticipated assistance

Hubbyaris