Why is my AC pulley making noise?

Pulley: If the compressor pulley bearings are failing, they can make noises, generally a grinding, roaring or squealing noise. Belt: If the serpentine belt is worn, it can slip when the compressor engages, causing noises. The noise would start when the compressor engages due to the increased load on the engine.Click to see full answer. Also asked, what does a bad AC pulley sound like? Loud noises when the compressor is running Another potential symptom of a failing AC compressor is loud or unusual noises. A worn bearing will produce a high pitched squealing or grinding sound, while a seized bearing will produce a grinding noise or a noticeable belt squeal. why is my air conditioner making a weird noise? Why Your Air Conditioner Is Making a Buzzing Sound Typically, the issue is either loose parts, missing or broken isolation feet, refrigerant leaks, or a malfunctioning compressor. Your AC can become frozen if refrigerant begins to leak from the unit, which often begins emitting a buzzing sound as a result. One may also ask, how do I know if my AC pulley is bad? Have your assistant turn on the AC controls to maximum. Listen for any internal buzzing or clicking from the clutch. If the clutch fails to engage and spin, but you hear electrical buzzing or clicks inside, it indicates an internal clutch short. Listen for excessive bearing noise coming from the clutch or compressor.Why does my air conditioner make a loud noise when it turns on?Compressor motor: This is a likely culprit if your air conditioner is only making the loud noise when it turns on. Your compressor motor is one of the most vital parts of your A/C. Fan motor: If your A/C is making a variety of grinding noises, it may mean that the motor needs lubrication or the bearings are bad.