[HayZee518]

the orifice tube is nothing more than a smaller diameter cappillary tube going into the evaporator line. this causes a pressure differential across it and changes the high pressure gas into a low pressure liquid that absorbs the heat. when it goes through the condenser the heat is given up and the liquid changes into a low pressure gas that can be compressed. the filter is usually changed with a new compressor. also, check your lubrication chart as to how much to put in - usually in ounces. - moisture free mineral oil that's meant for the type of refrigerant. the tool you are referring to for resizing the tubing is called a tube swager. (spel) it is used with a tubing flaring vise.