I had to replace almost everything when my hose started leaking becasue everything was corroded and not was not able to loosen anything. It all started with the main hose under the hood, when I was doing this I purchased the hose off ebay for 90 bucks and the accumulator/drier and orfice from R&S Strauss. When he went to put it in, the stock hose was frozen/corroded to the condensor and Y-Pipe which both needed replacing. About week later the lines that run fron to rear were leaking, I replaced them with high pressure hoses from Autocooling solutions, saved about 50 bucks over factory lines but you save a ton in labor. There is no need to remove the running boards and no chance of damaging the heater lines. When we went to do this the main lines were corroded/frozen onto to the rear evaporator, needed to buy a new one as well as expansion valve.
Ebay has a whole kit minus the lines that run front to rear. Wish I knew that before....... Im into the system for 1500 and my air started to blow warm on friday. Maybe know the compressor???? Not sure.......Good luck with yours but if its got high miles you may want to buy the complete kit off ebay. You will not find it cheaper anywhere!