Why Is There Abnormal Noise When the Car Air Conditioning Starts?

[MorganDella]

Abnormal noise when the car air conditioning starts is usually caused by moisture in the refrigerant system or mechanical damage to the compressor. Here is a detailed analysis of the specific situations: 1. Moisture in the refrigerant system: If there is air or moisture in the refrigerant system, abnormal noise will occur when the refrigerant evaporates and expands, making the user perceive the sound as coming from inside the dashboard. 2. Mechanical damage to the compressor: External abnormal noise is typically from the air conditioning compressor. If the noise is located near the compressor, there is a high probability of internal mechanical damage. If the noise recurs after some time and is located inside the dashboard, it is more likely due to reduced efficiency of the dryer bottle.

[Judith]

Last time when I started the air conditioning, there was a squeaking sound. It turned out to be a loose belt. It could be due to belt aging or insufficient tension, causing slippage and noise during startup; or it might be dust or looseness on the fan blades, creating an unbalanced rotation and humming sound. Compressor failure is more serious, sounding like metal friction. It's recommended to carefully listen to the source of the sound when starting the air conditioning. If it's a belt or fan issue, tightening or cleaning should suffice. However, compressor problems require professional inspection and repair. My car that time just needed a new belt, costing 150 yuan to fix. Don't ignore it, as a broken air conditioner in hot summer affects driving comfort and safety. Regular maintenance of the air conditioning system can reduce the occurrence of abnormal noises.

[VanStella]

From my experience with car maintenance, air conditioning startup noises are common minor issues. Dirty or loose fan blades can cause dull vibrations when rotating; worn-out belts with insufficient tension produce squeaky sounds; damaged compressor bearings or refrigerant leaks may result in clicking noises. Different sounds indicate different causes: clean the blades when hearing a whooshing fan noise; check belt tension for squeaks; compressor issues require professional attention. Brief startup sounds may be normal, but persistent abnormalities should be investigated. I recommend first locating the sound source yourself - handle simple components with DIY fixes, but visit a repair shop for complex issues to prevent worsening hidden dangers that could affect driving.

[DiLogan]

I've encountered air conditioning noises many times. Most often, it's due to dirt sticking to the fan blades, causing imbalance and a humming sound when rotating; or aging and loose belts producing squeaking sounds during startup; compressor issues result in even harsher noises. A single sound during startup is normal, but continuous noise warrants inspection. Cleaning the fan or tightening the belt might solve the problem. Compressor repairs can be costly, so it's better to address the issue early. Don't delay, as it affects cabin cooling and safe driving.