Why does the car make a squeaking noise when the air conditioner is turned on?

[DiGabriella]

The reasons for the squeaking noise when the car air conditioner is turned on are as follows: 1. Refrigerant moisture causing squeaking: Abnormal noises inside the air conditioner are often caused by moisture or air in the system refrigerant, which can be appropriately released. The compressor has high requirements for the electromagnetic clutch. Moreover, the electromagnetic clutch is installed close to the ground and frequently comes into contact with rainwater and mud. When the bearing in the electromagnetic clutch fails, it can produce abnormal noises. 2. Compressor drive belt: The tension of the compressor drive belt may also cause abnormal noises from the car air conditioner compressor. If the drive belt is too tight, the load on the electromagnetic clutch will increase.

[SanBrody]

The car AC makes a squeaking noise when turned on, and I've seen this issue in many cases. The most common cause is a loose or aged AC belt, which creates friction noise during operation. Worn-out AC compressor bearings or insufficient lubrication can also produce squeaking sounds, especially noticeable at startup. Accumulated dust or slight deformation on the blower fan blades causing vibration noise when air passes through is another frequent source. Abnormal refrigerant cycle pressure changes leading to unusual noises are relatively rare but shouldn't be ignored. The inspection method is simple: start the engine, turn on the AC, and listen whether the sound comes from under the hood or the front dashboard. Belt issues should be prioritized - manually pull the belt to check its elasticity. Don't delay repairs, otherwise a broken belt could leave you stranded, and a damaged compressor would require major repairs. I recommend going directly to a repair shop for diagnosis - replacing a belt or cleaning the fan costs little and prevents suffering in hot weather. Regular maintenance while driving daily reduces such troubles.

[CourtneyRose]

My old car used to squeak when the AC was on. The noise was quite annoying, like the fan was making a fuss. The mechanic told me it was probably something stuck in the blower fan blades or a loose belt. Dust buildup on the blades causes friction noise when spinning. As for the belt, rubber deteriorates over time, and when the AC puts extra load on it, it starts squeaking. In my case, cleaning the blades fixed the issue. You can try DIY: open the glove box, remove the blower fan, and check for debris. If you're not up for it, just head to a garage—replacing the blades costs just a few dozen bucks. Don’t procrastinate; prolonged noise not only reduces AC efficiency but also makes summer drives unbearable. Remember to dust it regularly and service the AC annually for hassle-free cooling.

[Ray]

Squeaking sounds are often caused by faulty components in the air conditioning system. For example, misaligned pulley positions or worn belts can produce friction noise. A lack of lubrication in the blower fan motor bearings may result in continuous squeaking, and deformed fan blades can produce similar sounds. In rare cases, internal compressor noise or insufficient refrigerant may be the culprit. To locate the issue: listen to identify the source—if near the vents, inspect the fan assembly; if under the hood, check the belt. For fixes, adding lubricant may resolve bearing issues, while damaged blades can be replaced affordably. I understand maintenance costs are low, but delaying repairs can worsen the problem and affect driving comfort. It's best to quickly identify the source and proceed with repairs.