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NO.9 NOISE WHILE OPERATING A/C SYSTEM

BHE070301038W11

9 | Noise while operating A/C system.
DESCRIPTION | • Noise from magnetic clutch, A/C compressor, hose or refrigerant line.
POSSIBLE CAUSE | • Magnetic clutch operation noise (Step 3) • A/C compressor slippage noise (Steps 4-6) • Hose or refrigerant line interference noise (Step 7)

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT A/C COMPRESSOR SLIPPAGE NOISE • Is there a squeaking or whirling sound (A/C compressor slippage noise)? | Yes | Go to Step 4.
No | Go to next step.
2 | INSPECT A/C COMPRESSOR INTERFERENCE NOISE • Is there a rattling or vibrating sound (interference noise)? | Yes | Go to Step 7.
No | Go to next step.
3 | INSPECT MAGNETIC CLUTCH OPERATION NOISE • Is there a clicking sound (magnetic clutch operation noise)? | Yes | Adjust clearance between pressure plate of magnetic clutch and A/C compressor pulley, then go to Step 8.
No | Condition is normal. (Recheck malfunction symptoms.)
4 | INSPECT DRIVE BELT • Inspect drive belt. • Is it normal? | Yes | Go to next step.
No | Adjust or replace drive belt, then go to Step 8.
5 | INSPECT DRIVE BELT CONDITION • Is drive belt worn? • Does it have foreign material imbedded in it, or have oil on it? | Yes | Remove obstruction, remove oil, or replace drive belt, then go to Step 8.
No | Go to next step.
6 | INSPECT MAGNETIC CLUTCH • Inspect magnetic clutch. • Is it normal? | Yes | Replace A/C compressor (excluding pressure plate, A/C compressor pulley, and stator), then go to Step 8. (See A/C COMPRESSOR REMOVAL/INSTALLATION.)
No | Replace magnetic clutch, then go to Step 8.
7 | CHECK TO SEE WHETHER MALFUNCTION IS IN A/C COMPRESSOR OR REFRIGERANT LINES • Is noise emitted from A/C compressor? | Yes | Visually inspect A/C compressor, replace appropriate parts if necessary, then go to next step.
No | If noise is due to refrigerant lines, repair detached or missing clips, tighten loose bolts, then go to next step.
8 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR • Has A/C compressor noise stopped? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.