Air-conditioning in modern cars is standard feature. If, however, you want to be sure that the air in your car is nice and clean, you must take good care of the cooling system. One of the most common causes of its failure are leaks. Therefore, you should have it checked regularly to avoid them. A quick way of checking if the cooling system is tight is to add ultraviolet to the compressor lubricant. This way you will locate any leaks by means of an ultraviolet lamp, which makes ultraviolet glow.
First, check the system for leaks, if you notice that the AC is not working properly
A faulty cooling system leaks the cooling agent or the compressor lubricant
Leaks in the system may cause seizure of the compressor and damage to the AC dryer.
Take good care of you AC system as repairing it may be very costly