I need to replace the AC compressor and expansion valve and dryer in my 2004 EP. Do I need to do anything special other than evacuate the freon from the system prior to removing the hoses and parts? I plan to install the new compressor, expansion valve and dryer the day before the system is recharged. Also, is there a way to remove the expansion valve other than removing the heater core unit under the dash? Is the compressor oil added with the freon together when the system is charged or do I need to do something else with that? Thanks