I assumed it was normal since I have heard it on other units in the neighborhood. Should it make this loud noise?

I have a Traen Model number 2TTB0036A1000AA. When I turn it on it cools for a couple of minute then it starts making a loud sound. It sounds like when the a/c belt of a car stops working or being forced. The sound gets so loud that I have to turn it off. The air that comes out when it starts making that sound is warm..