What is the Fault Diagnosis Method for Car Air Conditioning Systems?
1 Answers
Automotive air conditioning system fault diagnosis mainly involves four steps: look, listen, touch, and measure. The details are as follows: 1. Look: Generally, large buses have a separate glass observation window on the high-pressure liquid line of the air conditioning refrigeration system, while smaller vehicles usually have the observation window installed on the dryer filter tank. During the operation of the air conditioning system, the glass observation window can provide a rough indication of whether the refrigerant flow is appropriate. 2. Listen: This involves listening for any abnormal sounds from the machine, including: (1) Listening for any unusual noises or abnormalities during compressor operation—if present, it indicates a problem; (2) Listening for any abnormal sounds from the blower, condenser fan motor, etc.—if present, it indicates a problem; (3) If there is a belt noise, it suggests belt slippage; (4) If there is a screeching sound, it is caused by the aging of the electromagnetic clutch magnetic coil, insufficient magnetic force, and clutch disc slippage. 3. Touch: When faults occur in the refrigeration system and its main components, they often lead to abnormal surface temperatures of the system pipelines and main components. Therefore, changes in surface temperature can provide a rough assessment of the system's working condition and the performance of its main components. During specific inspections, tactile methods can be used for judgment. 4. Measure: While using the look, listen, and touch diagnostic methods, if a pressure gauge can be used to measure the high and low-pressure sides of the refrigeration cycle system, the diagnosis results will be more accurate.
