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Why does the belt make a screeching sound when the air conditioner is turned on?

2 Answers

ORiley

07/23/25 11:38pm

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.

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Sandra

08/10/25 7:27pm

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.

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