NOISE WHILE OPERATING A/C SYSTEM [FULL-AUTO AIR CONDITIONER]
NOISE WHILE OPERATING A/C SYSTEM [FULL-AUTO AIR CONDITIONER]
SM2335680
id0703c1701000
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Troubleshooting item |
Noise while operating A/C system |
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Description
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• Abnormal noise occurring from near A/C compressor during A/C operation
• Abnormal noise occurring from near A/C compressor regardless of A/C operation
• Occasional abnormal noise occurring from near A/C compressor during A/C operation
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Possible cause
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• Magnetic clutch malfunction
• Drive belt malfunction
• A/C compressor malfunction
• Hose or refrigerant line malfunction
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Diagnostic Procedure
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Step |
Inspection |
Action |
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1
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INSPECT A/C COMPRESSOR FOR SLIPPAGE NOISE
• Is there a squeaking or whirling sound (A/C compressor slippage noise)?
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Yes
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Go to Step 4.
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No
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Go to the next step.
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2
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INSPECT A/C COMPRESSOR FOR INTERFERENCE NOISE
• Is there a rattling or vibrating sound (interference noise)?
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Yes
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Go to Step 7.
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No
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Go to the next step.
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3
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INSPECT A/C COMPRESSOR VANE FOR NOISE
• Is there a jingling, popping, beeping, or buzzing sound (A/C compressor vane noise)?
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Yes
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Replace the magnetic clutch, then perform the repair completion verification.
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No
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Normal (Verify malfunction symptom.)
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4
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INSPECT DRIVE BELT
• Inspect the drive belt. (See DRIVE BELT INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].) (See DRIVE BELT INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
• Is it normal?
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Yes
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Go to the next step.
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No
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After adjusting the drive belt tension, go to the next step.
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5
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INSPECT DRIVE BELT
• Is there drive belt deterioration, foreign matter penetration in the belt, or oil on the belt?
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Yes
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Remove obstruction, remove oil, or replace drive belt, then perform the repair completion verification.
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No
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Go to the next step.
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6
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INSPECT MAGNETIC CLUTCH
• Inspect the magnetic clutch. (See MAGNETIC CLUTCH INSPECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
• Is the magnetic clutch normal?
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Yes
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Replace A/C compressor (excluding pressure plate, A/C compressor pulley, and stator), then perform the repair completion verification.
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No
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Replace the magnetic clutch, then perform the repair completion verification.
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7
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VERIFY LOCATION OF ABNORMAL NOISE OCCURRENCE
• Is noise emitted from A/C compressor?
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Yes
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Visually inspect A/C compressor, replace appropriate parts if necessary, then perform the repair completion verification.
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No
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If abnormal noise occurs from the hose or system piping, perform repairs in the area causing interference with the hose or system piping due to clip removal or screw looseness, then perform the repair completion verification.
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Repair completion verification
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VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR
• Has A/C compressor noise stopped?
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Yes
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Troubleshooting completed.
Explain repairs to customer.
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No
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
If the CAN communication is normal, perform the diagnosis from Step 1.
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