Noise Diagnosis - Air Conditioning (A/C) System
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Noise Diagnosis - Air Conditioning (A/C) System
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: Noise originating from the A/C compressor, drive belt or the A/C lines. | |||
| 1 | Were you sent here from Symptoms or another diagnostic table? | Go to Step 2 | Go to Symptoms - HVAC Systems - Automatic |
| 2 |
|
Go to Step 3 | Go to Step 9 |
| 3 | With the engine OFF, inspect the drive belt for excessive wear. Refer to Drive Belt Excessive Wear Diagnosis
in Engine Mechanical. Is the drive belt excessively worn? |
Go to Step 18 | Go to Step 4 |
| 4 | Inspect the drive belt tension. Refer to Drive Belt Tensioner Diagnosis
in Engine Mechanical. Is the drive belt tension correct? |
Go to Step 5 | Go to Step 19 |
| 5 | Inspect the drive belt for excessive oil coverage. Is the drive belt covered with oil? |
Go to Step 17 | Go to Step 6 |
| 6 |
|
Go to Step 24 | Go to Step 7 |
| 7 | Is the A/C compressor clutch slipping? | Go to Step 23 | Go to Step 8 |
| 8 |
CAUTION:
Refer to Moving Parts and Hot Surfaces Caution in Cautions and Notices. Using a stethoscope, listen to the A/C compressor for any abnormal noises.Is the compressor causing an abnormal noise? |
Go to Step 15 | Go to Step 10 |
| 9 | Does a moaning noise exist when the A/C clutch is engaged? | Go to Step 10 | Go to Step 12 |
| 10 | Listen to the A/C compressor components and mounting for noise concerns using a stethoscope. Are any of these components loose, damaged or excessively worn? |
Go to Step 20 | Go to Step 11 |
| 11 |
|
Go to Step 22 | Go to Step 13 |
| 12 | Does a vibration or rattle noise exist when the A/C clutch is engaged? | Go to Step 13 | Go to Step 14 |
| 13 | Does the noise stop when the A/C clutch is disengaged? | Go to Step 15 | Go to Step 25 |
| 14 |
|
Go to Step 21 | Go to Step 25 |
| 15 | Verify that the A/C system is properly charged. Refer to Refrigerant System Capacities . Is the A/C system properly charged? |
Go to Step 26 | Go to Step 16 |
| 16 | Recharge the A/C system to specification. Refer to Refrigerant Recovery and Recharging . Is the abnormal compressor noise still present? |
Go to Step 24 | Go to Step 26 |
| 17 | Repair the oil leak. Refer to the appropriate repair procedure in Engine Mechanical. Is the repair complete? |
Go to Step 26 | - |
| 18 | Replace the A/C drive belt. Refer to Drive Belt Replacement - Air Conditioning
in Engine Mechanical. Is the repair complete? |
Go to Step 26 | - |
| 19 | Replace the A/C drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Air Conditioning
in Engine Mechanical. Is the repair complete? |
Go to Step 26 | - |
| 20 | Repair or replace the A/C compressor mounting component. Is the repair complete? |
Go to Step 26 | - |
| 21 | Repair or replace the component which is causing the moaning concern as needed. Is the repair complete? |
Go to Step 26 | - |
| 22 | Correctly route or insulate the A/C component. Is the repair complete? |
Go to Step 26 | - |
| 23 | Replace the A/C compressor clutch. Refer to Clutch Rotor and/or Bearing Replacement (V-7) . Is the repair complete? |
Go to Step 26 | - |
| 24 | Replace the A/C compressor. Refer to Compressor Replacement . Is the repair complete? |
Go to Step 26 | - |
| 25 | The concern may be caused by an engine related component. Refer to Vibration Analysis - Engine
in Vibration Diagnosis and Correction. Did you find and correct the condition? |
Go to Step 26 | - |
| 26 | Operate the system in order to verify the repair. Did you find and correct the condition? |
System OK | Go to Step 2 |