What Causes the Abnormal Noise When the Car Air Conditioner is Turned On?

[ColemanLynn]

Car air conditioner produces abnormal noise for the following reasons: 1. Damaged compressor belt tensioner; 2. Excessive wear or damage to the blower motor; 3. Faulty internal and external circulation motor; 4. High pressure in the air conditioning system; 5. Improper engagement of the compressor clutch; 6. Air filter not replaced for a long time. Solutions for abnormal noise when the car air conditioner is turned on: 1. Clean the air conditioner vents promptly; 2. Remove the fan blades to add lubricating oil and clear foreign objects; 3. Replace the blower with a new one; 4. Replace the air filter.

[StBenjamin]

I've been driving for many years, and it's quite common to encounter strange noises when the air conditioning is turned on. The most common issue is something stuck in the blower fan, like small leaves or dust, which makes noise when the air blows. Another common problem is with the belt—older cars often have loose or worn belts that squeak when running. There's also the issue of a faulty compressor bearing, which produces a clicking sound. Once, my car's AC made noise, and I found debris in the air ducts—cleaning it fixed the problem. If left untreated, it could wear out other parts, leading to higher repair costs. I recommend first checking the blower fan and belt, trying to clean out the dust yourself. If that doesn't work, take it to a repair shop quickly. Don't delay too long—summer means frequent AC use, which can easily lead to more issues.

[LaMaddox]

As a regular car owner, I got quite a fright last time when my car's AC made strange noises. There was a squeaking sound when I turned on the AC, so I looked it up online—it might be due to deformed or worn-out blower fan blades. Or maybe some foreign object fell into the air duct, causing a buzzing sound when the AC is on. I was also worried it could be an electrical issue, like poor contact in the fan motor. A simple check you can do yourself: turn off the AC and listen for any other unusual noises in the engine compartment. Don’t underestimate these minor issues—over time, they can affect cooling performance. I got mine fixed for just a few hundred bucks. Usually, try to avoid using the recirculation mode, especially in dusty areas.

[Harriet]

The car's air conditioner makes strange noises as soon as it starts up. I suspect it could be a compressor issue or aging belts. It might be the drive belt slipping and causing squeaking sounds, or the blower bearing lacking lubrication. These problems shouldn't be delayed, as strange noises are often precursors to malfunctions. It's best to go to a professional shop for tool diagnostics as soon as possible, don't attempt to disassemble it yourself.

[McEdward]

When I encounter abnormal noises from the air conditioning, common causes include: fan blades hitting foreign objects, squeaking from loose drive belts, clicking sounds from loose compressor screws, and buzzing from debris stuck in the air ducts. Based on my driving experience, seasonal transitions are when these issues most frequently occur. The solution is to first turn off the system and inspect the engine compartment, cleaning dust from the air duct openings. If parts need replacing, don't skimp on costs, as otherwise, the noise may worsen and damage other components. Regular maintenance of the air conditioning system can prevent this.