What is the most common problem of air failure on an air conditioning system?

Question

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Answer 1

The evaporator coil may be frozen making the AC freeze up or a blocked vents and ducts, dirty filters or faulty fan can also be the cause of insufficient airflow.

Answer 2

Loss of Freon via pinholes in either the condenser or evaporator coil with time. It starts with noticing airless, less cold and it ends with the compressor stopping to its safeties built in.

Answer 3

Air failure in Air conditions could be caused by accumulation of dust or any form of blockage of the air duct. While Cooling failure is caused by the exhausted of the coolant, and the accumulation of dust. Leakages of the coolant could be another reason for this.