I have to replace the two hoses on my ac compressor. My question is do i have to get the system vacumed out or can i just add the freon to it from one of those kits at advanced?
Ryan
95 Z28

 

Once the system is opened, it should be evacuated with a vacuum pump in order to get all the air and moisture out. Moisture in the system will cause icing and pevent it from working. and air will dilute the refrigerant.