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HVAC 849 HVAC 3 Noise while operating A/C system TROUBLESHOOTINGHINTS • Magnetic clutch operation noise Step 4 • A/C compressor vane noise Step 5-13 • A/C compressor slippage noise Step 14-17 • Hose or refrigerant line interference noise Step 18 INSPECT A/C COMPRESSOR VANE NOISE Is there a jingling, popping, beeping, or buzzing sound (A/C compressor vane noise) ? INSPECT A/C COMPRESSOR SLIPPAGE NOISE Is there a squeaking or whirling sound (A/C compressor slippage noise) ? INSPECTA/C COMPRESSOR INTERFERENCENOISE Is there a ratting or vibrating sound (interference noise) ? INSPECT MAGNETIC CLUTCH OPERATIONNOISE Is there clicking sound (magnetic clutch operation noise) ? INSPECTA/C COMPRESSOR NOISE TIME Is noise heard continuously for more than 3 seconds after A/C compressor comes on? INSPECT IDLE SPEED Is it okay? INSPECT REFRIGERANTAMOUNT Inspect refrigerant amount. See REFRIGERANT SYSTEM SERVICE PROCEDURES, REFRIGERANT CHARGE CHECK Is it okay? Go to Step 5. Go to next step. Go to Step 14. Go to next step. Go to Step 18. Go to next step. Adjust clearance between pressure plate of magnetic clutch and A/C compressor pulley, then go to Step 19. Condi t ion is normal . (Recheck malfunction symptoms.) Go to next step, Condition is normal. (Noise occurs for 2- 3 seconds immediately af ter A/C compressor turns on.) Go to next step. Adjust idle speed, then go to Step 19. Go to Step 10. Go to next step. Yes No Yes No Yes No Yes No Yes No Yes No Yes No 1 2 3 4 5 6 7 STEP INSPECTION ACTION