I saw in your original post that you replaced the "line".
Was this a new steel cooler line?
The reason I ask is because sometimes the flare cracks and it's really hard to notice.
Even hard to see.
I had originally thought that my original return line was leaking so I bought a set of lines off ebay and replaced the return line only. They were suppose to be direct fit but were anything but. I then put my original line back on and it actually leaked a little more but once I removed the fitting I could see why it leaked as the end of the fitting where it connects to the line actually had a dimple in it from the return line. I don't know the hardness of the brass that the NAPA fittings are but it seems awful soft. I plan on pulling the original line off again and checking it with a magnifying glass to see if there is any cracks. The after market line actually leaked less but looking at both ends together the flares are not the same, the original line I think has a better flare. I wish I knew someone around here with a magnaflux machine that I could check the ends for cracks. The cracks would stick out like a sore thumb.
