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AT AT AT AT Air Air Air Air Conditioner Conditioner Conditioner Conditioner - 181 - Diagnosis Diagnosis Diagnosis Diagnosis and and and and Testing Testing Testing Testing A/C A/C A/C A/C system system system system performance performance performance performance diagnosis diagnosis diagnosis diagnosis 5. A/C system actuator noise diagnosis. Step Operation Yes No 1 Whether or not to conduct this diagnosis based on “symptoms” or Go to Step 2. — 2 ①Start the engine. ②Finish the settings below: Blower motor speed Air heater, ventilation and A/C system modes Temperature control setting ③Define the noise types: Scraping, bang Tick/click, chirp or creak Whish/howling Is the scraping or bang obvious during mode selection or temperature Go to Step 6. Go to Step 3. 3 When the blower motor speed reduces, is there still tick/click 、 chirp, Go to Step 6. Go to Step 4. 4 Is whish/howling obvious under every mode but not so under every Go to Step 6. Go to Step 5. 5 Is there obvious whish/howling only under “DEFROST” or “FLOOR” Go to Step 6. Go to Step 6. 6 Remove the instrument panel bracket. ①Check damper for normal operation. ②Check air duct for blockage or foreign matter. Does any of the above condition occur? Go to Step 9. Go to Step 7. 7 Check modes, temperature dampers and seals for warpage or crack. Is the damper under normal status? Go to Step 10. Go to Step 8. 8 Replace relevant dampers and/or seals. Is the maintenance finished? Go to Step 10. — 9 Remove obstruction or foreign matter. Is the operation finished? Go to Step 10. — 10 Install the instrument panel bracket. Is the operation finished? Go to Step 11. — 11 Run the system to check the maintenance result. Is the fault detected and eliminated? System is normal. Go to Step 2. |