Well the coils are always near the outside skin because they are the hot pressure side of the cooling loop. If they were inside the insulation, none of that heat would escape properly.
Good to know thanks!...I know there is a thread somewhere explaining how to mix up some backing soda or something to find the lines but I haven't located it yet.
Edit: Ah,,, I see JohnyRotten already alluded to it.
I cut the evaporator line in mine cutting out the plastic. I am in the process of fixing it. Jb weld putty the cut. Got a bullet piercing valve to gain access to the low pressure line. You can rent a vacuum pump at auto zone for free.