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One of the most common faults in car air conditioning systems is that they are not cold, which not only affects driving comfort but may also hide potential damage risks to air conditioning components. Whether it is auto parts dealers, repair service providers, or end car owners, mastering common fault causes and troubleshooting methods can quickly locate problems and reduce repair costs. This article will provide a detailed analysis of the fault logic, specific manifestations, and troubleshooting techniques from nine core dimensions: refrigerant, compressor, condenser, evaporator, fan, pipeline, expansion valve, electrical, and sensor. It is recommended to keep it as a backup.
Reminder: Before troubleshooting, please ensure that the vehicle is in idle mode, the air conditioning is set to maximum cooling mode, and the windows are closed to avoid external environmental factors affecting the troubleshooting results; It is recommended that operations involving pipeline disassembly and refrigerant filling be completed by professionals to ensure safe and standardized operation.
1、 Compressor malfunction (air conditioning system 'heart' failure)
The compressor is the "heart" of the car air conditioning system, responsible for compressing low-temperature and low-pressure refrigerant into high-temperature and high-pressure gas, promoting refrigerant circulation and refrigeration. Once the compressor fails, the air conditioning system will not be able to cool properly.
【 Fault Symptoms 】: After turning on the air conditioner, the air outlet does not cool at all and only emits natural air; The compressor does not start, accompanied by obvious abnormal noise; The compressor clutch cannot be engaged or immediately disconnected after engagement; Abnormal high and low pressure in the air conditioning system (high pressure too low, low pressure too high).
【 Troubleshooting Method 】: 1 Start the vehicle, turn on the air conditioning, and observe whether the compressor clutch is engaged. If it is not engaged, check whether the clutch coil and relay are normal; 2. Touch the compressor casing with your hand. If the casing is too hot or too cold and has no cooling effect, it may be due to internal wear, jamming, or damage to the compressor pump body; 3. Check the power supply voltage and circuit of the compressor, and eliminate circuit faults.
【 Simple solution 】: If it is a clutch failure, the clutch coil or relay can be replaced; If the compressor is damaged internally, it needs to be disassembled and inspected, and if necessary, the compressor assembly needs to be replaced; After replacement, it is necessary to refill the refrigerant and refrigeration oil to ensure sufficient lubrication of the compressor.
