Though air conditioning systems have been refined and evolved technologically through the years, their purpose remains the same: they cool air and remove humidity from it. The basic parts of an AC system are the compressor, the condenser, the receiver-dryer, the expansion valve or orifice tube and the evaporator. All parts combine to form a loop in which the refrigerant is constantly cycled. The belt driven compressor pressurizes the refrigerant, which is in a gaseous state and sends it to the condenser where heat is removed. Then the refrigerant (which is liquefied in the condenser) is sent to the receiver-dryer to remove any moister, and it’s allowed to expand by an expansion valve or orifice tube, which also controls the refrigerants flow. The refrigerant enters the evaporator which is located behind the dash. There it absorbs heat from the surrounding air and vaporizes. A blower motor blows the cool air in the cabin. From the condenser the refrigerant (again in the form of gas) returns to the compressor to begin another cycle. All of the parts mentioned are of course subjects to failure. In many cases refrigerant leaks may occur and can be detected using specialized equipment. What is important to know is that since 1996 the refrigerant universally used is the one known as R134a, anything used before that should be replaced due to its damaging effects on the environment. Despite the fact that R-134a is not considered as damaging to the environment as previously used refrigerants, its release in the atmosphere is strictly prohibited. Therefore having the know how to fix ac systems is not enough. Technicians who wish to intervene in any way on ac systems should obtain a license to handle R134a and the appropriate equipment. Here at Alkis Car Servicing we have both; therefore we can service, repair or recharge your ac system according to legal guidelines.