A/C refrigerant Leak.

Has anyone had r134a refrigerant leak in a 1999 nb ? After fixing that common fuse issue and getting the compressor to kick on it still blows warm. Recovered refrigerate and pulled a vaccum on system for 30 minutes. Does not hold the vaccum indicating a leak in system. Just wondering if there are any common problems before I Pull the rest of my hair out looking for it. 2 hours with electronic leak detecter nothing . Before I polute the system with dyes or leak fixing r134a just thought i'd ask. Thanks