What Causes Loud Noise When the Car Air Conditioner is On?
2 Answers
Car air conditioner producing loud noise is caused by: 1. Different types of refrigerant added to the air conditioner. If the types added before and after are inconsistent, it may lead to excessive noise from the air conditioner; 2. Issues with the tightness of the air conditioner compressor belt. If it's too loose, it can also cause the air conditioner to be excessively noisy; 3. Overfilling of refrigerant in the air conditioner, which increases the load on the compressor, thereby increasing the workload. To determine if there's an excess of refrigerant, you can check the inspection window of the air conditioner. If there is liquid and a few bubbles when the air conditioner is on, it indicates the refrigerant level is normal. If there are no bubbles or very few bubbles, it suggests an overfill of refrigerant.
The car's air conditioning is making loud noises, possibly due to issues with the fan system. Unbalanced blades or a damaged fan motor can cause a humming sound. An aging compressor may produce a squeaking noise due to increased friction during rotation. A loose belt can create a chirping sound during high-speed operation. Blocked air ducts, such as a dirty filter, can significantly increase noise as airflow is obstructed. Insufficient refrigerant leads to high system pressure, causing the system to work harder and produce louder noises. I've handled many similar cases and recommend servicing the air conditioning system annually—cleaning the filter, checking belt tension—to avoid noise affecting driving comfort. If the issue persists, visit a professional repair shop early to prevent component damage from escalating into costly repairs. Regular maintenance is key to extending the system's lifespan.
