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 | |||||||
2 | A/C system noises can be generally categorized into 3 areas:
Is a screeching, squealing noise heard when the A/C is engaged? | Go to Step 3 | Go to Step 10 | ||||||
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 19 | Go to Step 4 | ||||||
4 | Inspect the drive belt tension. Refer to Drive Belt Chirping, Squeal, and Whine Diagnosis. Is the drive noise repaired? | Go to Step 5 | -- | ||||||
5 | Inspect the drive belt for rumble or vibration. Refer to Drive Belt Rumbling and Vibration Diagnosis. Is the drive belt rumble or vibration repaired? | Go to Step 6 | -- | ||||||
6 | Inspect the drive belt for excessive oil coverage. Is the drive belt covered with oil? | Go to Step 18 | Go to Step 7 | ||||||
7 |
Is the A/C compressor locked up? | Go to Step 24 | Go to Step 8 | ||||||
8 | Is the A/C compressor clutch slipping? | Go to Step 23 | Go to Step 9 | ||||||
9 |
Warning: Refer to Moving Parts and Hot Surfaces Warning in the Preface section. Using a stethoscope, listen to the A/C compressor for any abnormal noises. Is the compressor causing an abnormal noise? | Go to Step 16 | Go to Step 11 | ||||||
10 | Does a moaning noise exist when the A/C clutch is engaged? | Go to Step 11 | Go to Step 13 | ||||||
11 | 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 12 | ||||||
12 |
Are any of the A/C components grounding out and causing a vibration noise? | Go to Step 22 | Go to Step 13 | ||||||
13 | Does a vibration or rattle noise exist when the A/C clutch is engaged? | Go to Step 14 | Go to Step 15 | ||||||
14 | Does the noise stop when the A/C clutch is disengaged? | Go to Step 16 | Go to Step 25 | ||||||
15 |
Do any of the A/C components cause an abnormal noise? | Go to Step 21 | Go to Step 25 | ||||||
16 | 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 17 | ||||||
17 | 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 | ||||||
18 | Repair the oil leak. Refer to Oil Leak Diagnosis. Is the repair complete? | Go to Step 26 | -- | ||||||
19 | Replace the drive belt. Refer to Drive Belt Replacement. 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 Compressor Clutch Assembly Replacement. Is the repair complete? | Go to Step 26 | -- | ||||||
24 | Replace the A/C compressor. Refer to Air Conditioning 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. 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 | ||||||
