What causes the buzzing noise when the car's air conditioning is turned on?
2 Answers
The reasons for the buzzing noise when the car's air conditioning is turned on are: damage to the car's air conditioning compressor, blockage of the air conditioning vents, wear of the fan blades, engine noise, etc. Damage to the car's air conditioning compressor includes lack of lubrication, wear of the rotating shaft, inability to compress air normally, or air leakage. In this case, it is necessary to go to a repair shop or 4S store for professional inspection. The solution to the noise caused by blocked air conditioning vents is to clean the vents in time. It should be noted that the car's air conditioning filter should also be cleaned and replaced regularly. Generally, the car needs to be cleaned every 5,000 kilometers. If the noise is caused by wear of the fan blades, the fan blades need to be removed for detailed inspection.
I've encountered the situation where the car AC makes a sizzling sound several times, usually due to some issues with the compressor. When the compressor bearings age or lack lubrication, they produce noise during rotation, sounding like a sizzle. Additionally, if the belt is too loose or worn, its friction with the pulley can also create similar sounds. I once helped a friend diagnose this and found insufficient refrigerant was overloading the compressor; after topping it up, the noise disappeared. It's best to take it to a repair shop for a comprehensive check. Compressor repairs or belt adjustments aren't overly complicated, but delaying could lead to bigger failures, especially dangerous if the AC fails during summer highway driving.
