That is typically where the blower motor is located. Maybe something fell into the blower motor. Does your car have a cabin air filter? It would be directly above the blower motor. If it got wet or tore somehow, a portion might have dropped into the fan in the blower.
The engineās water pump can make a whirring sound. Thatās been a precursor to water pump failure on my truck a couple of times. And air trapped in the cooling system can make weird sounds as the bubbles pass through the heater (located in the glove box area on many cars). Iāve had that happen on my Corolla, a gurgling sound. Like if you empty a full bottle of beer by tipping it upside down & pouring it all out at once. That sound.