To determine if a car air conditioner is clogged, multi-dimensional observations can be made: If the air volume from the vents is significantly reduced and the cooling efficiency drops, priority should be given to checking whether the air conditioner filter is excessively dusty or the air duct is blocked. If abnormal local temperatures (such as overcooling or overheating) are detected when touching the pipes, this indicates potential ice blockage or dirt blockage in that section. Ice blockage typically manifests as periodic cooling failure, which can be resolved by vacuum drying and replacing the dryer filter; dirt blockage requires replacement of the capillary tube assembly or cleaning of the clogged weld. During maintenance, It is best to use nitrogen to purge accumulated oil from the condenser and ensure the refrigerant charge meets specifications. If self-diagnosis proves difficult, the system should be referred to professional technicians who can use pressure gauges to measure high and low system pressures, thereby avoiding misdiagnosis and compressor damage. Regular replacement of the air conditioner filter (recommended every 15,000 kilometres or annually) during routine maintenance can prevent dust blockage. Selecting certified service centers for refrigerant replenishment can mitigate this risk.
