Why does the Civic make noise when the air conditioning is turned on?

[Margot]

Abnormal noise in the air conditioning duct: The air filter has not been replaced for a long time, and there are foreign objects such as leaves in the duct. Abnormal noise from the air conditioning compressor: Poor heat dissipation of the air conditioning or blocked pipes can cause abnormal noise from the compressor. When the refrigerant is insufficient, the internal pistons of the compressor are not fully lubricated during operation, resulting in metal friction sounds under the high pressure of the refrigerant. Definition: The automotive air conditioning device (air-conditioning-device), referred to as car air conditioning, is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car cabin to the optimal state. It provides a comfortable riding environment for passengers, reducing travel fatigue, and creates good working conditions for the driver, playing an important role in ensuring safe driving. Composition: It generally includes refrigeration devices, heating devices, and ventilation devices. This combined system makes full use of the limited space inside the car, featuring a simple structure and easy operation, making it a popular modern automotive air conditioning system internationally.

[VanJayce]

I encountered a similar issue last time I drove my Civic. The mechanic said it's mostly caused by belt aging, especially that 'squeaking' sound when the AC kicks in—80% chance it's a loose or cracked compressor belt. Last time when we took it off, the inner side of the belt was already frayed. After replacing it with a new one, the noise disappeared immediately. If you notice the AC cooling weakening along with the noise, get it checked ASAP—it might be the tensioner pulley seizing up and causing belt slippage. Don't ignore such minor issues; fixing it costs around 200 yuan. If you delay, you might end up damaging the compressor, and that'll cost you a fortune.

[MacAustin]

As a car repair shop owner with ten years of experience, I see several cases of Civic air conditioning noise every week. If there's a 'buzzing' low-frequency vibration sound, focus on checking the screws of the air conditioning bracket. Once, a white Civic was opened up to find the compressor rubber mounts completely worn out, causing metal to directly hit the frame, which was the source of the loud noise. If it's a 'clicking' sound like small stones, it's likely that the radiator fan blades are tangled with a plastic bag. Last time, a car owner pulled out a whole clump of poplar catkins from between the fan blades, which had been washed in during car washing. For such issues, don't attempt to dismantle things yourself—the coolant pipes are very fragile. It's safest to leave professional tasks to professionals.

[CoraDella]

The 'gurgling' sound when turning on the AC? This might indicate overcharged refrigerant. Last year, my cousin's Civic had this issue after maintenance at a roadside shop—pressure tests showed levels 1.5 times above standard. The compressor struggled with muffled noises, and the mechanic warned that prolonged use could damage piston rings. A 'hissing' leak sound is even riskier, signaling aged O-rings at AC pipe joints leaking Freon. Both scenarios require immediate attention: the former costs around $100 for refrigerant evacuation, while the latter demands O-ring replacement—ask the mechanic to clean the condenser simultaneously, boosting cooling efficiency by 20%.