If you're going to install the Z Tube or Popcharger, read this: (link). This thread discuses the problem in detail and could save you hundreds in repair.

Repaired the link, but it appears that the original post was damaged during the site conversion.

This solution has worked for me for over a year now...
Here is a photo to give you a clearer understanding of the problem:


Here's another post regarding the rubbing of the A/C line: (link)