3. NOISE WHILE OPERATING A/C SYSTEM TROUBLESHOOTING HINTS 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 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.) 5 Inspect idle speed Is it okay? Yes Go to next step No Adjust idle speed, then go to Step 19. 6 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. 7 Inspect refrigerant line Inspect refrigerant lines. Is piping free of damage and cracks? Are piping connections free of oil grime? (Visual Inspection) Are piping connections free of gas leakage? Are piping installation points on condense free of gas leakage? 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, repair or replace connection and replace condenser, then go Step 19 FATC 45
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