NOISE WHILE OPERATING A/C SYSTEM 3. 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 STEP INSPECTION ACTION No Repair wiring harness between A/C relay and magnetic clutch, then go to next step. 8 Verify that malfunction symptom occurs after repair Does cool air blow out? (Is refrigerant system performance test result correct?) Yes Troubleshooting completed. Explain repairs to customer. No Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs. FATC 48
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