Auto A/C Compressor Noise Troubleshooting chart.
| SYMPTOMS | CONDITION | POSSIBLE CAUSE | REMEDY |
| Compressor Noisy | AC compressor internal noise | Bearing worn or damagedDefective cylinder/or shaft | Disassembly and replace defective parts. |
| Magnetic Clutch Noisy. | Rattling noise when magnetic clutch is not engaged . | Bearing worn or damaged. | Replace bearing. |
| Noise from piping | Piping not secured. | Piping vibrating .Pulsating noise resonates into body. | Secure piping. |
| Noise from condenser | Condenser vibration prominent. | Condenser mounting stay resonating with body . | Secure by inserting rubber between stay and body. |
| Noise produced by bracket. | Rattles when touched, continuous rattling heard when operating. | Bracket cracked or broken.Mounting bolts loose. | ReplaceRetighten bolts. |
| Idler pulley noisy. | Clattering noise produced. Rattles when touched. | Bearing broken.Bracket Cracked or loose. | ReplaceReplace or retighten. |
| Noisy crankshaft pulley. | Rattles. | Improperly installed. | Replace or retighten. |
| Belt Noisy | Belt deflection excessiveBelt side surface wornBelt worn | Belt wornBelt center misalignedWorn belt causing belt slipping on pulleys and tensioner | Adjust tensionAlign centerReplace belt |
| Noisy belt tensioner | Squealing belt and/or rumbling noise | Tensioner bearing or tensioner spring weak | Replace belt and tensioner |
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