Blower Noise
A constant air rush noise is typical of high speed blower operation.
Some systems and modes are more noisy than other systems. If possible, verify
the noise using a similar vehicle in order to determine if the noise is typical
or excessive.
Vibration/Rattle
Important: Feel the lines, the hoses, and the brackets during the diagnosis. Many
noises stop when you contact the component.
Potential causes include the following conditions:
| • | The belt is not in proper alignment in the pulley groove. |
| • | The belt tensioner is faulty. |
| • | The lines or the hoses are in contact with each other. |
| • | The brackets are loose. |
| • | Other drive components are faulty. |
Moans
Potential causes include the following conditions:
| • | The A/C charge is not proper. |
| • | Other drive components are faulty. |
| • | A bracket is loose or is not in proper alignment. |
| • | The lines or the hoses are in contact with each other. |
| • | The heater hoses are not correctly routed. |
Screech
Potential causes include the following conditions:
| • | The belt is serpentine. |
| • | The compressor bearings are faulty. |
| • | The compressor clutch is faulty. |
