Auto AC repair is quite similar to an ordinary air conditioning unit repair. Any system that lowers temperature basically works in the same way. First you take Freon and place it in a sealed system. Freon is then pressurized using a compressor. As it is pressurized, it gets hot by absorbing the heat around it. This hot gas is then circulated through a series of tubes that dissipate the heat. Scientifically, the gas removes heat rather than adds cold. Freon gas can lose lots of its heat, in other words it gets really cold, when you reduce the pressure. As it cools, it becomes a liquid. That’s when cool air is generated.
Auto repair shops usually check the compressors first when you bring your car in for an AC check up. Auto AC repair usually involves set ups with the compressor because this is the major part of the unit. And like other AC units, Freon level is second on the to-do list for auto AC repair. R-134a refrigerant is the standard for car ACs today. It is a reformulated refrigerant that is less harmful to the environment. If your car is not yet compatible with the said refrigerant, you can easily have it converted by the auto repair shop.