What could this sound be (video)

There is a voice that I do not know the source of my friends.
the https://youtu.be/b9qce9l-44

the belt tension the ball with one hand, it may have distributed the ball a little bit like a sibob hitting sound

Sir, the belt and tensioner have just changed because of this sound, but it still continues. The bad thing is, the voice is lost or not heard until you go to the service.

There are aluminum parts in the front, the exhaust shield, the sound of their bottom will be muted.

Is there an alternator gear group or air conditioner?

It is as if the air conditioner engine comes on and off. Electromagnet is activated with the same sound in the pulley of the air conditioner engine, normally but one click

Friends, the problem is on the ball of the air conditioning and charger.

It was clear that there was a ball sound. it sounded like a ball bearing without oil.