Noise Diagnosis - Air Conditioning (A/C) System
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. 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 - Manual in HVAC Systems Manual or Symptoms - HVAC Systems - Automatic in 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 23 | Go to Step 7 |
| 7 | Is the A/C compressor clutch slipping? | Go to Step 23 | Go to Step 8 |
| 8 | 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 24 |
| 14 |
|
Go to Step 21 | Go to Step 24 |
| 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 24 | 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 23 | Go to Step 25 |
| 17 | Repair the oil leak. Refer to the appropriate repair procedure in Engine Mechanical. Is the repair complete? |
Go to Step 25 | - |
| 18 | Replace the drive belt. Refer to Drive Belt Replacement
in Engine Mechanical. Is the replacement complete? |
Go to Step 25 | - |
| 19 | Replace the drive belt tensioner. Refer to Drive Belt Tensioner Replacement
in Engine Mechanical. Is the replacement complete? |
Go to Step 25 | - |
| 20 | Repair or replace the A/C compressor mounting component. Is the repair complete? |
Go to Step 25 | - |
| 21 | Repair or replace the component which is causing the moaning concern as needed. Is the repair complete? |
Go to Step 25 | - |
| 22 | Correctly route or insulate the A/C component. Is the repair complete? |
Go to Step 25 | - |
| 23 | Replace the A/C compressor. Refer to Compressor Replacement (LL8) or Compressor Replacement (LM4) . Is the replacement complete? |
Go to Step 25 | - |
| 24 | 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 25 | - |
| 25 | Operate the system in order to verify the repair. Did you find and correct the condition? |
System OK | Go to Step 2 |