PRE-RELEASE
Noise Diagnosis - Air Conditioning (A/C) System
| Noise Diagnosis - Air Conditioning (A/C) System |
| Step | Action | Yes | No | ||||||||||||||||||
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DEFINITION: Noise originating from the A/C compressor, drive belt, or the A/C lines.
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1
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Were you sent here from Symptoms or another diagnostic table?
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Go to
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Go to
Symptoms - HVAC Systems - Automatic
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2
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Is a screeching, squealing noise heard when the A/C is engaged? |
Go to
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Go to
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3
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With the engine OFF, inspect the drive belt for excessive wear. Refer to the appropriate procedure:
Is the drive belt excessively worn? |
Go to
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Go to
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4
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Check the drive belt tension. Refer to the appropriate procedure:
Is the drive belt tension correct? |
Go to
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Go to
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5
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Inspect the drive belt for excessive oil coverage.
Is the drive belt covered with oil? |
Go to
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Go to
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6
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Is the A/C compressor locked up? |
Go to
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Go to
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7
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Is the A/C compressor clutch slipping?
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Go to
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Go to
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8
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Refer to
Moving Parts and Hot Surfaces Warning
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Using a stethoscope, listen to the A/C compressor for any abnormal noises. Is the compressor causing an abnormal noise? |
Go to
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Go to
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9
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Does a moaning noise exist when the A/C clutch is engaged?
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Go to
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Go to
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10
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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
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Go to
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11
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Are any of the A/C components grounding out and causing a vibration noise? |
Go to
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Go to
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12
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Does a vibration or rattle noise exist when the A/C clutch is engaged?
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Go to
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Go to
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13
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Does the noise stop when the A/C clutch is disengaged?
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Go to
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Go to
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14
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Do any of the A/C components cause an abnormal noise? |
Go to
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Go to
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15
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Verify that the A/C system is properly charged. Refer to
Refrigerant System Specifications
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Is the A/C system properly charged. |
Go to
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Go to
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16
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Recharge the A/C system to specification. Refer to
Refrigerant Recovery and Recharging
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Is the abnormal compressor noise still present? |
Go to
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Go to
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17
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Repair the oil leak. Refer to the appropriate procedure:
Is the repair complete? |
Go to
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-
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18
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Replace the drive belt. Refer to the appropriate procedure:
Is the replacement complete? |
Go to
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-
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19
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Replace the drive belt tensioner. Refer to the appropriate procedure:
Is the replacement complete? |
Go to
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-
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20
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Repair or replace the A/C compressor mounting component.
Is the repair complete? |
Go to
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-
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21
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Repair or replace the component which is causing the moaning concern as needed.
Is the repair complete? |
Go to
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-
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22
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Correctly route or insulate the A/C component.
Is the repair complete? |
Go to
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-
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23
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Replace the A/C compressor clutch.
Is the repair complete |
Go to
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-
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24
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Replace the A/C compressor. Refer to
Air Conditioning Compressor Replacement (LDK/A20NHT)
Air Conditioning Compressor Replacement (LBS/A20DTH)
Air Conditioning Compressor Replacement (LAU/A28NER)
.
Is the repair complete? |
Go to
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-
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25
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The concern may be caused by an engine related component. Refer to
Vibration Analysis - Engine
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Did you find and correct the condition? |
Go to
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26
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Operate the system in order to verify the repair.
Did you find and correct the condition? |
System OK
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Go to
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