There may be several reasons why the air conditioner buzzes when the car is turned on:
1. Dirty air conditioning filter element causes excessive noise and abnormal sound.
2. There are sundries in the fan blades of the blower, causing abnormal sound. You can start the blower directly without starting the car to see if there is any sound. If the sound appears, you can be sure that it is the sound of the blower.
3. The fan blades of the automobile air conditioner are deformed and the fan motor is damaged.
4. It may be that the clutch bearing in the air conditioning pump is worn, which causes the engine sound to become louder after turning on the air conditioner. This component has not been replaced separately, and the air conditioning pump assembly needs to be replaced.
5. Blower screw is loose due to vibration.
6, fan blades and other parts caused by collision;
7, caused by foreign bodies entering the air duct;
8, fan motor wear and damage;
Causes and solutions of abnormal sound of Mercedes-Benz E-class air conditioner: 1, abnormal sound of Mercedes-Benz E-class air conditioner compressor, as a high-speed rotating working part, has a high failure probability, and abnormal sound is a common failure.
(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)