Unusual Cabin Noise When AC is On
The noise occurs inside the cabin only when the AC is running, suggesting an issue with the HVAC system, such as a failing blower motor, debris in the air duct, or a worn compressor clutch.
Diagnosis Details
Possible Causes
Blower motor bearing failure or debris in the fan cage
AC compressor clutch or belt issue
Refrigerant expansion noise or low refrigerant level
Related OBD-II Codes
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What You Should Do
Inspect the cabin air filter for debris, listen for the noise source (blower motor vs.
compressor), and check the blower motor for foreign objects or bearing wear.
If the noise is from the engine bay, check the AC compressor and belt.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
