If there is an issue with your car AC, then it is more likely that you might have noticed the car air conditioner making loud buzzing noise often. There are different kinds of noises that your car AC can make, but if it's a buzzing noise, then you must know that the car’s compressor needs a fix! In most cases, the buzzing noise comes out when there is too much refrigerant on the car AC, so you get an overcharged system. And when the excess liquid starts entering the compressors’ intake port, it starts vibrating that in turn causes the buzzing noise.