Why does the belt make a screeching sound when the air conditioner is turned on?
4 Answers
Possible reasons for the belt making a screeching sound when the air conditioner is turned on: The car's air conditioner belt is too loose, causing it to slip, or there is a fault with the car's compressor, or there are foreign objects in the blower and ventilation ducts. Below is the relevant content introduction: Solutions for the squeaking sound when the air conditioner is turned on: The air conditioner pulley and the belt slip, producing a sharp friction sound during the slipping process. Check if there is any oil stain on the belt. If the belt slips due to oil stains, clean it thoroughly. If not, adjust the compressor's position bolt to tighten the compressor's belt, thereby increasing friction.
I've always thought that the squealing noise when turning on the air conditioner while driving is caused by a loose or aged belt. When the AC compressor starts, the engine load increases. If the belt isn't tight enough, it will slip against the pulley, generating heat through friction and producing that screeching sound. This phenomenon becomes more noticeable in hot weather because belts are prone to deformation or hardening under high temperatures. Neglecting regular maintenance, such as cracks or dirt accumulation on the belt, can accelerate this issue. I recommend checking the belt tension every six months by pressing it manually to ensure proper elasticity – if it's too loose or too stiff, it should be replaced. Delaying replacement may lead to belt breakage, affecting other components like the water pump and alternator, resulting in more troublesome and costly repairs. Car owners can also perform simple visual inspections to check for signs of wear.
Recently, I've been hearing a screeching sound when driving with the AC on. At first, I thought it was an engine issue, but a car-savvy friend explained that it's due to the AC belt slipping. When the compressor kicks in, it increases the load, and if the belt isn't properly tensioned or has aged and cracked, the friction causes louder noise. It might be due to using a low-quality belt or lack of maintenance over time, worsened by dust and rainwater contamination. This noise becomes particularly loud during turns or acceleration, which is not only annoying but also affects my mood. I've tried spraying some specialized belt conditioner for temporary relief, but it's best to visit a repair shop soon to have a mechanic check the belt tension and replace it if necessary. Don't ignore this issue—if the belt breaks over time, not only will the AC stop working, but the engine could overheat, leading to potentially expensive repairs. Pay attention to unusual sounds during daily driving and address them promptly for peace of mind.
As an ordinary driver, encountering a screeching sound from the air conditioning belt is a sign of belt looseness. Increased load can cause slipping and screaming, so it's recommended to inspect and replace it. Take timely action to avoid potential hazards.
