Noise Diagnosis - Air Conditioning (A/C) System
WARNING: This page is about a different car, the 2022 Cadillac CT4. 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 | Symptoms - HVAC Systems - Automatic |
| 2 |
|
Go to Step 3 | Go to Step 8 |
| 3 | With the engine OFF, inspect the air conditioning compressor belt for excessive wear or slipping:
Is the air conditioning compressor belt excessively worn or slipping? |
Go to Step 17 | Go to Step 4 |
| 4 | Inspect the air conditioning compressor belt for being oil soaked. Is the air conditioning compressor belt soaked with oil? |
Go to Step 16 | Go to Step 5 |
| 5 |
|
Go to Step 21 | Go to Step 6 |
| 6 | Is the air conditioning compressor clutch slipping? | Go to Step 21 | Go to Step 7 |
| 7 | Using a stethoscope, listen to the air conditioning compressor for any abnormal noises. Is the air conditioning compressor generating an abnormal noise? |
Go to Step 14 | Go to Step 9 |
| 8 | Does a moaning noise exist when the air conditioning clutch is engaged? | Go to Step 9 | Go to Step 11 |
| 9 | Listen to the air conditioning compressor components and mounting for noise concerns using a stethoscope. Are any of these components loose, damaged or excessively worn? |
Go to Step 18 | Go to Step 10 |
| 10 |
|
Go to Step 20 | Go to Step 12 |
| 11 | Does a vibration or rattle noise exist when the air conditioning compressor clutch is engaged? | Go to Step 12 | Go to Step 13 |
| 12 | Does the noise stop when the air conditioning compressor clutch is disengaged? | Go to Step 14 | Go to Step 13 |
| 13 |
|
Go to Step 19 | Go to Step 23 |
| 14 | Verify that the air conditioning system is properly charged. Approximate Fluid Capacities Is the air conditioning system properly charged? |
Go to Step 23 | Go to Step 15 |
| 15 | Recharge the air conditioning system to specification. Refrigerant Recovery and Recharging Is the abnormal air conditioning system noise still present? |
Go to Step 22 | Go to Step 23 |
| 16 | Repair the oil leak. Refer to the appropriate repair procedure in Engine Mechanical. Is the repair complete? |
Go to Step 17 | - |
| 17 | Replace the air conditioning compressor belt:
Is the replacement complete? |
Go to Step 23 | - |
| 18 | Repair or replace the air conditioning compressor mounting component. Is the repair complete? |
Go to Step 23 | - |
| 19 | Repair or replace the component which is causing the moaning concern as needed. Is the repair complete? |
Go to Step 23 | - |
| 20 | Correctly route or insulate the air conditioning component. Is the repair complete? |
Go to Step 23 | - |
| 21 | Replace the air conditioning compressor. Air Conditioning Compressor Replacement (LSY)
, or Air Conditioning Compressor Replacement (L3B)
, or Air Conditioning Compressor Replacement (LF4) Is the replacement complete? |
Go to Step 23 | - |
| 22 | The concern may be caused by an engine related component. Vibration Analysis - Engine Did you find and correct the condition? |
Go to Step 23 | - |
| 23 | Operate the system in order to verify the repair. Did you find and correct the condition? |
System OK | Go to Step 2 |