Ooh! Ask me!! Me!! My hand is up!!
Problem with our 4th gens, is the a/c lines bracket under the pass. sliding door doesn't get moisture cooked off by the cat. Everybody with a rear a/c unit should get under their van and remove that bracket and come up with a different way to strap/brace those lines. I made a spiderweb of zip ties,, looks rinckey dink, but lines are secure.
Now for the fun and important stuff.
I had that puddle in front of my pass rear tire, and no cooling. My high pressure line/small diameter was blowing out r134.
1) I measured the OD of the line that was leaking, along with the large diameter/return line just for good measure with my calipers.
2) Then, I got online to a place local to me, called "online metals". They give dimensions of various aluminum tube, properties, yada yada. And, you can order up short pieces, like 6 inches, maybe less. I got a few different pieces of both sizes.
3) Then, I band sawed the most promising size, in half lengthwise, test fitted around my leaking line, and it fit better than a glove.
4) Got a bunch of fuel injector hose clamps. I chose these cuz they don't have a flat spot on them like radiator hose clamps. That, and for this application, they make a miserable job that much more difficult! Practice test fitting them onto the split alum tubing fitted around the a/c line. Have this down pat!! Be able to put 3-5 clamps on tight on minutes!
5) Get some of "Mr Sticky's" "VibraBond" epoxy. Unlike regular epoxy, which is brittle, "Mr Sticky's" has some elasticity/flexibility.
6) Clean the a/c lines with acetone really well. REALLY well!
7) Mix up enough "Mr Sticky's" to coat both halves of your split tube line clamp. Quick.
8) place split tube line clamp over leaky spot of your a/c line and start attaching and tightening your fuel injector line clamps, starting from the mid point of the split tube, out to the ends.
9) let sit of a day.
10) go to a/c repair shop and ask them to evac and recharge your system.
This is what I did, and has been holding for a year. Parts wise, cost probably about $30. Time spent,, uhh,,,.. But, hopefully, someone else will benefit off my experience..