What Causes the Buzzing Sound When the Car Air Conditioner is Turned On?
2 Answers
The reasons for the buzzing sound when the car air conditioner is turned on are: 1. Damaged air conditioner blower bearing; 2. Faulty air conditioner compressor; 3. Damaged motor of the exhaust fan inside the air conditioner; 4. Excessive dirt inside the air conditioner. The solutions to the buzzing sound when the car air conditioner is turned on are: 1. Replace the air conditioner blower; 2. Replace the air conditioner compressor; 3. Replace the exhaust fan; 4. Clean the air conditioner. The functions of the car air conditioner are: 1. Achieve cooling effect by continuously cycling the refrigerant; 2. Remove dust, odors, smoke, and toxic gases from the air inside the car, making the air fresher, and humidify the air inside the car to increase the relative humidity.
I had the same issue with my old Nissan before. When the AC was turned on, it would make this annoying buzzing sound. Normally, it's just the sound of the compressor working—a light buzzing noise. But if the noise is too loud, it could be due to a loose or worn-out belt. A loose belt tends to slip and create that buzzing sound. Fan problems are also quite common; if leaves or dust get stuck in the blades, the imbalance can cause a buzzing noise. Insufficient refrigerant can increase the compressor's workload, making the noise louder. I tried checking it myself: pop the hood, start the car, turn on the AC, and listen for where the sound is coming from. If it's from the fan area, a simple cleaning might fix it. If it's from the compressor side, then you need to pay attention. My advice is not to delay—get it checked early to avoid bigger expenses. During maintenance, have someone check the belt tension and the cooling system—it’ll save you a lot of hassle.
