What is the Diagnostic and Troubleshooting Mnemonic for Car Air Conditioning Failures?
1 Answers
Car air conditioning system fault diagnosis mnemonic is: one look, two listen, three touch, four measure. Specifically: 1. One look: Generally, large buses have a separate glass inspection window on the high-pressure liquid line of the air conditioning refrigeration system, while smaller vehicles usually have the inspection window on the dryer filter tank. During the operation of the air conditioning system, the refrigerant flow can be roughly judged by observing through the glass inspection window. 2. Two listen: Listen for any abnormal sounds from the machine operation, mainly including: (1) Listen for any abnormal noise from the compressor operation, if there is, it is abnormal; (2) Listen for any abnormal noise from the blower, condenser fan motor, etc., if there is, it is abnormal; (3) If there is a belt sound, it indicates belt slippage; (4) If there is a screeching sound, it is caused by the aging of the electromagnetic clutch magnetic coil, insufficient magnetic attraction, and clutch disc slippage. 3. Three touch: When faults occur in the refrigeration system and its main components, it often leads to abnormal surface temperatures of the system pipelines and main components. Therefore, the working state of the system and the performance of the main components can be roughly judged based on the changes in surface temperature. During specific inspections, the touch method can be used for judgment. 4. Four measure: While using the look, listen, and touch diagnostic methods, if the pressure gauge can measure the high and low side pressures of the refrigeration cycle system, the judgment results will be more accurate.
