can not locate ac freon leak.

[kglowacky]

I wanted share my a/c problem on my 78 retrofit LS1. I pressure tested my system all good. Drive for about a month and no freon. Pressure test, all good. Then Freon would leak out after driving while. Put dye in system no leaks sitting in driveway, drive awhile, empty . Found dye around the ac compressor connection. Replaced o ring recharged same problem. Took it a great mechanic. He called me asked who made the new hoses on my retrofit. I said I did. Here what he told me.
Believe it or not.
I made a hose that went from the dryer to the compressor. Made it as short as I could (about 12 inches) LOL. Looked good, in a straight line fender side to fender sider side. He said when I drove the truck the engine would flex and when it flexed it would move enough to cause a leak at the compressor fitting.(basicly the hose restricted the engine from flexing and put a great deal of pressure on the hose, the hose was holding the engine from flexing.) He made me a new hose that was longer with a small loop and haven't had a problem since. Hope this may help someone.