What Causes the Zizzing Noise from Car Air Conditioning Vents?
2 Answers
There are several possible reasons for abnormal noises coming from car air conditioning vents: 1. Air conditioning compressor noise: Many factors can cause compressor noise, such as damage to the compressor electromagnetic clutch. As a high-speed rotating component, internal wear or severe faults in the compressor can generate abnormal sounds. 2. Electromagnetic clutch noise in the compressor: Since the compressor frequently operates from low to high speeds under heavy loads, high demands are placed on the electromagnetic clutch. When the bearings inside the electromagnetic clutch are damaged, noise occurs. 3. Loose or excessively worn compressor drive belt, misaligned pulley, or damaged tensioner pulley bearing: An overly loose drive belt can cause the electromagnetic clutch to slip, while an overly tight belt increases the load on the clutch. 4. Excessive wear or damage to the blower motor: Foreign objects in the blower, insufficient cooling oil, or dry friction on mating surfaces may produce abnormal noises.
Having driven for over twenty years, I've come across the common issue of a buzzing sound from the air vents quite often. Usually, it's caused by small debris clogging the air ducts, like leaves or dust stuck on the fan blades, creating friction that results in this noise. It could also be due to wear and tear on the fan motor bearings, which, as they age, struggle to turn smoothly and produce unusual sounds. I once resolved this issue myself by using a vacuum cleaner to clean out the vents. If the noise persists, it might be necessary to visit a repair shop to check the motor or the entire air duct system. Don't underestimate this buzzing sound; if left unattended, the fan could get stuck, leading to reduced cooling efficiency and increased fuel consumption, especially noticeable in the summer. Regularly cleaning debris around the vents can prevent these issues. I make it a habit to thoroughly clean my car every quarter to avoid such hassles.
