Surely you know what air conditioning is, but do you know how it works? Contrary to what you might expect, AC systems do not create cool air. Instead, they cool the air by removing hot air and moisture. The system conditions the air by cooling it and removing moisture to make you more comfortable while you drive. There are three types of air conditioning systems: orifice tube systems or expansion valve systems or a combination of the two which is found in rear air conditioning systems. The air conditioning system is made up of the following components: compressor, condenser, evaporator, orifice tube (or expansion valve), and an accumulator (or receiver-drier). Each of these components serves a different purpose.