Is there a resolve for the whirring sound inside the cabin when fan on?

Select fan speed manually .. Increase stereo volume .. Visit auto repair facility, display concerns to mechanic.

Strongly agree with Pushrod,and also check your door seals(the rubber/felt),or whatever yours might be. i had a sound like that not long ago on my ole truck,found one door seals crimped,could not hear the sound until i turned on the blower fan motor? might not be your problem,but it was mine...