Noise Diagnosis - Air Conditioning (A/C) System
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Were you sent here from Symptoms or another diagnostic table? | Go to Step 2 | Go to Symptoms - HVAC Systems - Manual or 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 Falls Off and Excessive Wear Diagnosis
. 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
. Is the drive belt tension correct? |
Go to Step 19 | Go to Step 5 |
| 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 | 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 14 |
| 14 |
|
Go to Step 21 | Go to Step 25 |
| 15 | Verify that the A/C system is properly charged. Refer to Refrigerant System Capacities (Non-HP2) or Refrigerant System Capacities (HP2) . 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 (Non HP2) or Refrigerant Recovery and Recharging (HP2) . Is the abnormal compressor noise still present? |
Go to Step 25 | Go to Step 26 |
| 17 | Repair the oil leak. Refer to OIL LEAK DIAGNOSIS
for appropriate repair procedure in Engine Mechanical. Is the repair complete? |
Go to Step 26 | - |
| 18 | Replace the A/C drive belt. Refer to Air Conditioning Compressor Belt Replacement
. Is the replacement complete? |
Go to Step 26 | - |
| 19 | Replace the A/C drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Air Conditioning
. Is the replacement 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 Compressor Clutch Plate/Hub Assembly Replacement . Is the replacement complete? |
Go to Step 26 | - |
| 24 | Replace the A/C compressor. Refer to Air Conditioning Compressor Replacement (LY2, LY5, LH6, L76, L92 and LMG) or Air Conditioning Compressor Replacement (HP2) . Is the replacement complete? |
Go to Step 26 | - |
| 25 | The concern may be caused by an engine related component. Refer to Vibration Analysis - Engine
. 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 |