What is the reason for the belt noise when turning on the AC that stops after a while?

[VonGideon]

This is a fault caused by the smooth wear of the contact surface between the belt and the pulley. Here are the relevant details: 1. Car Air Conditioning: The car air conditioning system is used to regulate and control the temperature, humidity, air cleanliness, and airflow inside the car cabin to the optimal state, providing a comfortable riding environment for passengers and reducing travel fatigue. It also creates good working conditions for the driver and plays an important role in ensuring safe driving. 2. Timing Belt: The timing belt is an important component of the engine's valve system. It connects to the crankshaft and ensures accurate intake and exhaust timing through a specific transmission ratio. Belts are used instead of gears for transmission because they produce less noise, have minimal self-variation, and are easy to compensate for.

[JonathanLynn]

My own car occasionally makes a brief squealing noise from the belt when the AC is turned on, then quiets down. This is usually caused by a slightly loose belt or slipping due to a humid environment. When the AC compressor kicks in, it increases the load, and the belt needs a moment to adjust to the tension. If a new belt is installed slightly too tight or an old belt is a bit loose, the friction-generated heat causes it to expand and grip properly, stopping the noise. Ignoring this can lead to premature belt wear or reduced AC efficiency, compromising driving safety. It's recommended to inspect the belt every six months for cracks or excessive looseness and adjust it promptly to avoid unexpected breakdowns. Simple maintenance can save significant costs—don’t wait until it becomes severe. This issue is more common in winter due to higher humidity and less frequent in drier summer conditions, but staying vigilant is always wise.

[LaKatherine]

The belt noise that only lasts for a short while is mostly caused by belt slippage when the compressor starts. The high load and insufficient tension generate heat through friction, causing the belt to expand and contract, which stops the noise. This is especially common with old belts, as they become hardened and loose after long-term use. I've encountered this issue multiple times, and tightening the belt usually solves it. Ignoring this can lead to serious hazards, such as belt breakage damaging the engine or causing air conditioning failure. During regular maintenance, pay special attention to the belt's condition and tension to ensure it's properly adjusted. Environmental factors like humidity on rainy days can also cause temporary noise, which disappears after the belt dries during operation. Proper maintenance extends component lifespan and enhances peace of mind.

[KennedyLee]

When I drive with the AC on, the belt squeaks and then stops. It might be due to slight looseness or surface moisture, causing temporary friction before adapting. It doesn't affect daily use, but if the noise persists for too long, check for aging or cracks. A simple fix is to wipe off dust with a cloth. Timely maintenance makes the car more durable—don't let small issues turn into disasters. Good habits save hassle and money.

[AriannaFitz]

Recalling the past, old cars often had belts squealing when the AC was turned on, then quieting down. The reason was the belt slipping back and forth before heating up and tightening. Experience taught me that looseness was the main cause, with humidity making it worse during the rainy season. Even though modern cars have improved, this issue still occurs. It's recommended to regularly check belt tension to avoid aging and breakage, which could affect driving safety. Before replacing the belt, tightening it a bit might solve the problem.

[StLincoln]

The AC belt squeaks for a while then stops, commonly caused by new belt break-in or temporary slippage due to humid weather. The noise disappears as the belt hardens when temperature rises. No need to worry, but prolonged squeaking indicates potential hazards like looseness or cracks that require attention. Maintenance is simple—record service intervals and set phone reminders for belt replacement to ensure smooth operation. Modern cars rarely have issues, but staying vigilant extends belt lifespan.