208 sound when the air conditioner is turned on

Hello sentence, my car is 208 1.6ehdi automatic 2012
There is no sound when I turn on the air conditioner in the car, but when the car fell to the rolanT, there is a very interesting buzzing sound.

When it comes to the hummingbird, it is not because it turns on the fan.

Just a little too much idling, while the vehicle is self-precisely