my ac compressor had a hole knocked through the top so i ordered a re-manfactured one. i seen on a website that when replacing the compressor or anything else i should replace the ac receiver/drier along with it. being im sure mine has never been replaced or it was done long ago im going to go ahead and change it. im not experienced with ac system work so i have some questions. i wont have any problems getting parts changed out, but after i get them on everything will be empty. do i need to just charge the system like normal? or will i need to charge and flush and recharge due to the fact that i dont know how much oil or any of that is currently in the current system parts? im going to be taking the car to the auto shop on base and i will be helped by them but i want some sort of knowledge before i go there.