2. 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. • STEP INSPECTION ACTION 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 ratting 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 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 Inspect refrigerant lines. Is piping free of damage and cracks? • Are piping connections free of oil • grime? (Visual Inspection) • Yes Go to next step. No If piping or A/C component (s) is damaged or cracked, replace then go to Step 19.If there is gas leakage, HVAC W/O ETC 25
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