Weird noise... what is it??

[azngenius35]

this is really weird but I noticed this sound when it was starting to get cold outside and I had to use the heaters.

It comes like from the air vents and gets louder when I accelerate and vice versa.

I tend to freak out about anything that goes wrong with this car.

Anyone else have the same thing happen??

[The Ripe Punani]

Haha, I know the AC/heater fan goes faster when I accelerate. When I idle it's a normal sound then when I accelerate, as the car is going faster I can hear the fan getting a bit louder at a time.