What Are the Causes of Abnormal Noises from Car Air Conditioning Vents?
2 Answers
There are many reasons for abnormal noises in car air conditioning, including damage to the car air conditioning compressor, blockage of the air conditioning vents, wear of the fan blades, etc. Damage to the car air conditioning compressor: Lack of lubrication, wear of the rotating shaft, and inability to compress normally. When the air conditioning compressor has problems, the car's air conditioning system will produce abnormal noises or fail to cool. Blockage of the air conditioning vents: Simply clean the air conditioning vents in a timely manner. It should be noted that the car air conditioning filter should also be cleaned and replaced regularly. Generally, it should be cleaned every 5,000 kilometers of driving. Wear of the fan blades: Loss of lubrication in the fan bearings or obstruction of the fan blades by foreign objects. Check if there is any damage at the root of the fan blades and replace them promptly if necessary; inspect the gears in the gearbox and replace the entire gearbox if any damage is found; ensure the fan is placed stably and tighten all loose components to prevent noise. Abnormal noise from the blower or air conditioning flap motor: Noise caused by foreign object obstruction or damage itself. In such cases, simply disassemble the bearing and add some grease for lubrication.
I've been driving for over a decade, and air vent noises are all too common. My car used to make this buzzing sound, like a tiny insect flying around. Turned out leaves had gotten into the air ducts - the intake vents below the windshield often trap debris. When the blower fan gets small trash like candy wrappers stuck to it, you'll hear rattling noises during operation. Loose vent louvers also cause clicking sounds when adjusting airflow direction. I've taken mine apart specifically to check - those plastic clips on the air deflectors tend to crack with age. A dirty cabin air filter contributes too, creating wheezing noises as air struggles to pass through. While annoying, these sounds are actually easy to fix - just clean the intake vents and replace the filter yourself, then tighten the vent louver screws.
