For 1990-2009 cars

## Noise Diagnosis - Air Conditioning (A/C) System 1

Condition | Possible Cause
--- | ---
Compressor Noise | Resonant compressor noises are not a cause for alarm. However, irregular noises or rattles may indicate broken parts or excessive wear.

• | The A/C system is overcharged. Refer to Refrigerant Recovery and Recharging .

• | The compressor mounting bolts are not torqued to specification.

• | The compressor pulley bearing is faulty.

• | The compressor drive belt is slipping.

Refrigerant Line/Hose Noise |

• | The lines/hoses are grounded. Reposition the A/C lines/hoses.

• | The lines/hoses are rubbing on other components. Reposition and secure the A/C lines/hoses.

Internal Compressor Noise |

• | A faulty piston shoe

• | A faulty bearing

• | A faulty cylinder

• | A faulty shaft

Replace the compressor. Refer to Compressor Replacement .

Compressor Clutch Noise |

• | A faulty compressor clutch. Replace the compressor clutch. Refer to Compressor Clutch Plate and Hub Assembly Removal (V5 - Direct Mount) and Compressor Clutch Plate/Hub Assembly Install (V5 - Direct Mount) .

• | A faulty bearing. Replace the compressor. Refer to Compressor Replacement .

HVAC Module Noise |

• | Foreign material is in the HVAC module.

• | The HVAC module is not torqued to specification.

• | The actuator doors are damaged.

• | The actuator door seals are damaged.

Blower Motor Noise |

• | Foreign material is on the fan.

• | The fan blades are damaged.

• | The blower motor has internal damage.