NO.8 NOISE WHILE OPERATING A/C SYSTEM [FULL-AUTO AIR CONDITIONER]
id0703c1803300
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8
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Noise while operating A/C system.
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DESCRIPTION
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• Noise from magnetic clutch, A/C compressor, hose or refrigerant line.
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POSSIBLE CAUSE
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• Magnetic clutch operation noise (Step 3)
• A/C compressor slippage noise (Steps 4—6)
• Hose or refrigerant line interference noise (Step 7)
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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 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 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 MAGNETIC CLUTCH OPERATION NOISE
• Is larger than other this type vehicle clicking sound (magnetic clutch operation noise)?
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Yes
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Adjust clearance between pressure plate of magnetic clutch and A/C compressor pulley, then go to Step 8.
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No
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Condition is normal. (Recheck malfunction symptoms.)
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4
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INSPECT DRIVE BELT
• Inspect the drive belt.
• 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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Adjust the drive belt tension.
If the symptom does not improve after drive belt adjustment, replace the drive belt.
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5
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INSPECT DRIVE BELT CONDITION
• Is drive belt worn?
• Does it have foreign material imbedded in it, or have oil on it?
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Yes
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Remove obstruction, remove oil, or replace drive belt, then go to Step 8.
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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.
• Is it normal?
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Yes
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Replace A/C compressor (excluding pressure plate, A/C compressor pulley, and stator), then go to Step 8.
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No
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Replace magnetic clutch, then go to Step 8.
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7
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CHECK TO SEE WHETHER MALFUNCTION IS IN A/C COMPRESSOR OR REFRIGERANT LINES
• 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 go to the next step.
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No
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If noise is due to refrigerant lines, repair detached or missing clips, tighten loose bolts, then go to the next step.
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8
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VERIFY THAT MALFUNCTION SYMPTOM OCCURS 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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Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
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