Why does the car air conditioner make a cricket-like noise?
3 Answers
It could be due to the blower or the belt. Turn off the A/C; if the noise stops, it's likely the air conditioner belt. If the noise persists, observe whether the frequency changes—if it does, the issue is with the blower and it may need replacement. Below is more information about car air conditioners: 1. Introduction: The car air conditioning device (air conditioning device), referred to as car AC, is used to adjust and control the temperature, humidity, air cleanliness, and airflow inside the car cabin to optimal conditions. It provides a comfortable environment for passengers, reducing travel fatigue, and creates good working conditions for the driver, playing a crucial role in ensuring safe driving. Generally, it includes a cooling device, heating device, and ventilation system. This integrated system makes full use of the limited space inside the car, featuring a simple structure and ease of operation, making it a popular modern car air conditioning system internationally. 2. Layout: Different types of air conditioning systems have varying layouts. Currently, integrated heating and cooling systems are widely used in passenger cars. The layout involves assembling the evaporator, heater radiator, centrifugal blower, and control mechanism together, known as the air conditioning unit assembly.
Over my many years of driving, I've encountered the cricket-like chirping sound from car AC systems quite often. Most of the time, it's caused by a loose or worn-out AC belt in the engine compartment, especially in vehicles that are three to five years old or older. When the belt slips, it produces that squeaking noise, just like crickets on a summer night. It could also be due to insufficient lubrication in the AC compressor bearings, causing dry friction and noise. If you've recently recharged the refrigerant, it might be overcharged or have air mixed in, leading to abnormal compressor operation. Another possibility is leaves stuck in the blower fan blades, which would create a sharper tapping sound. I recommend getting it checked at a repair shop as soon as possible. Don't delay—if the belt suddenly snaps, both the AC and alternator could stop working.
Last time when my car's AC made cricket-like noises, I specifically asked an experienced mechanic what was wrong. He said such high-frequency abnormal sounds are 80% likely caused by belt issues, especially noticeable in humid weather. When belts get wet or oily, they slip and produce a squealing noise, like rubbing a wet finger on a glass. If the compressor itself malfunctions, the sound would be duller, more like whistling. There's also a small chance it's caused by vibrating AC pipes hitting the car frame - this type of noise may temporarily disappear if you press on the pipes. Regardless of the cause, never attempt to disassemble the compressor yourself, as the refrigerant is under pressure and can harm your skin. The best approach is to park the car and take it directly to a professional shop. They'll use a stethoscope to pinpoint the exact noise source, saving you time and effort.
