A/C help the expansion valve
A/C help the expansion valve 
If you are talking about any of the parts concealed inside the black fiberglass box that extends into the engine bay from the insid of the car, yes, you yave to remove it from the inside. There are some bolts you have to remove from inside the engine bay and some that you have to remove from inside the dash. I think that you have to remove the whole dash completely in order to remove that box. What I did was tear that box appart and threw it all in the trash and installed a block off plate.
