guys my accord have a whistle sound in it. Before the sound was very low so i thought what ever. now when i was driving with my air conditioner on it sound so bad and very loud. i dont know what cause it. But for sure that is not my exhaust. So what happen?

 

Could potentially be a bad weather seal around a window or door. A small leak would whistle if there were enough airflow, such as highspeeds or large pressure difference when running your A/C

 

Could be a loose belt if it is really loud with your a/c on. Just make sure they are all tight.