You're right Chico, but you can't fing a leak unless there is somrthing to leak. Considerring R-12 at $40.00 for 12 oz. I would rather make the conversion and use the R-134A for $5.99 for the same size.
The leak may be so small that you may wait until something major need repairing then fix the leak.
Always look ahead and try to kill two birds with one stone.
Good luck with your effort, you will over come.
Happy Trails Beep Beep from Houston!!!
Donald, El Cheapo