Why does the car make a buzzing sound when the air conditioner is turned on?
2 Answers
Car air conditioner making abnormal noises is usually caused by a dirty air filter element leading to excessive noise. It is recommended to clean the air filter element. Below is relevant information about the function of the air filter element: Ensuring the air filter fits tightly against the housing: Prevents car windows from fogging up with vapor, ensuring clear visibility for drivers and passengers, thus enhancing driving safety; Provides fresh air to the cabin, preventing occupants from inhaling harmful gases and ensuring driving safety; Effectively sterilizes and deodorizes. Effectively intercepts pollen: Maintains clean cabin air free from bacterial growth, creating a healthy environment; Effectively separates solid impurities such as dust, powder, and grinding particles from the air; Effectively intercepts pollen, ensuring that drivers and passengers do not experience allergic reactions that could affect driving safety.
With 20 years of car repair experience, I've found that when the AC makes a buzzing noise, it's usually due to these common issues: the radiator fan bearings are loose or the blades are hitting debris, especially noticeable during summer traffic jams; worn AC compressor bearings or a belt that's too tight or loose can also cause a whining sound, which typically varies with engine RPM. Another possibility is blocked AC lines or insufficient refrigerant causing the compressor to run noisily. For older cars, it's also worth checking if the cooling fan bracket is deformed, as aged or cracked rubber damping pads can transmit vibration noise. Don't delay repairs—these abnormal noises may indicate reduced cooling efficiency, and prolonged neglect could burn out the compressor clutch.
