What Causes the Buzzing Vibration Sound When the Mercedes-Benz Air Conditioner is On?

1 Answers
DeLillian
07/29/25 3:47pm
In most cases, the buzzing sound that occurs when the car's air conditioner is turned on is a normal phenomenon. Below is relevant information about the car's air conditioning system: Principle: When the air conditioner is in automatic operation mode, it controls the airflow mode and speed automatically based on the target temperature set by the user. At the moment the air conditioner starts, if there is a significant difference between the set target temperature and the actual temperature inside the car, the air conditioning system will automatically select the highest fan speed to achieve rapid cooling. This causes the blower to produce a noticeable airflow sound. This sound is generated by the high-speed operation of the air conditioning system's blower and is a normal vehicle phenomenon. Solution: Adjust the temperature setting switch/knob to change the target temperature and reduce the difference between the set temperature and the actual temperature inside the car. Adjust the fan speed setting switch/knob to lower the fan speed, and switch from automatic control mode to manual mode.
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