My A/C works good for 5min and then it leaks out of that A/C line on the left rear wheel well thats intended for the rear 3rd row occupants. I would like to just get rid of that line entirely and plug it with a bolt or something, any ideas? I can image its very expensive at the dealer, also, how the heck do you loosen that big nut, impossible to get off?

 

An indy AC shop should be able to handle that for you. But it may be more expensive to modify lines than simply find the leak and repair. As an example, there are O-rings in the fittings of the rear unit. Here's a page from the RAVE shop manual. If going indy shop, would suggest you print out the AC section from RAVE and take it with you.