Why does the car make a squeaking noise when the air conditioning is turned on?
2 Answers
Reasons for the squeaking noise when the car's air conditioning is turned on: The squeaking noise may be due to the car's air conditioning belt being loose and slipping, a malfunction in the car's compressor, or foreign objects in the blower and ventilation ducts. Solutions for the squeaking noise when the air conditioning is turned on: 1. Slipping of the air conditioning pulley and belt: During the slipping process, sharp friction sounds may occur. Check if there is oil or dirt on the belt. If the belt is slipping due to oil or dirt, clean it thoroughly. If not, adjust the compressor's position bolts to tighten the belt, thereby increasing friction. 2. Loose belt causing noise: Press the belt to check its tension. If it's too loose, tighten it. If the belt has been used for too long, it needs to be replaced. 3. Damaged belt tensioner: Replace it with a new one. 4. Foreign objects in the blower and ventilation ducts: Clean the blower and ventilation ducts.
Over the years of driving, I've encountered the squealing sound from the AC quite a few times, usually caused by aging or loose AC belts. Belts wear out over time, and when the surface becomes smooth, they slip, producing that screeching noise. It could also be due to a faulty compressor bearing, but that noise is a continuous high-pitched sound. Checking for a loose belt is simple: pop the hood, start the car with the AC on, and see if the belt wobbles or has cracks. I recommend not delaying—squealing means parts are wearing out. If left too long, the belt could snap, rendering the AC useless, and driving without cool air in summer is unbearable. Best to take it to a repair shop for the mechanic to check the belt tension and tensioner; replacing the belt usually fixes it. Other causes like fan motor issues are rare, but a thorough check is safer. Don't ignore it thinking it's minor—small problems can lead to costly, time-consuming repairs if neglected.
