HVAC 39 HVAC 3 NOISE WHILE OPERATING A/C SYSTEM TROUBLESHOOTING HINTS 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 1 Inspect A/C compressor vane noise Is there a jingling, popping, beeping, or buzzing sound (A/C compressor vane noise)? Yes Go to Step 5. No Go to next step. 2 Inspect A/C compressor slippage noise Is there a squeaking or whirling sound (A/C compressor slippage noise)? Yes Go to Step 14. No Go to next step. 3 Inspect A/C compressor interference noise Is there a rattling or vibrating sound (Interference noise)? Yes Go to Step 18. No Go to next step. 4 Inspect magnetic clutch operation noise Is there clicking sound (Magnetic clutch operation noise)? Yes Adjust clearance between pressure plate of magnetic clutch and A/C compressor pulley, then go to Step 19. No Condition is normal. (Recheck malfunction symptoms.) 5 Inspect A/C compressor noise time Is noise heard continuously for more than 3 seconds after A/C compressor comes on? Yes Go to next step, No Condition is normal. (Noise occurs for 2-3 seconds immediately after A/C compressor turns on.) 6 Inspect idle speed Is it okay? Yes Go to next step. No Adjust idle speed, then go to Step 19. 7 Inspect refrigerant amount. See refrigerant system service procedures, refrigerant charge check Is it okay? Yes Go to Step 10. No Go to next step. 8 Inspect refrigerant line Yes Go to next step.
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