What Causes the Buzzing Sound When Turning on the Air Conditioning in a Mercedes?
1 Answers
When the car's air conditioning is turned on and a buzzing sound occurs, it may be due to the following reasons: 1. Dirty air conditioning filter: A dirty filter can cause excessive noise and abnormal sounds. 2. Debris in the blower fan blades: Foreign objects in the blower fan blades can lead to abnormal sounds. You can test this by turning on the blower without starting the engine to see if the sound appears. If it does, the issue is likely with the blower. 3. Fan problems: Deformed fan blades or a damaged fan motor in the car's air conditioning system. 4. Worn clutch bearing: A worn clutch bearing inside the air conditioning pump can cause the engine sound to become louder when the air conditioning is on. This component cannot be replaced separately and requires the replacement of the entire air conditioning pump assembly.