I need help. My Iriz 1.6 CVT 2015 has some aircond problem. After top up the refrigerants, it could only lasts for max of 2 weeks, then it'll be very empty. Confirm leak but I don't know where, got some suspect la. I found some oil dripping from the hose drain down at the engine bay, looks like it came from the cooler assembly.

For reference, I just changed the condenser and cooling coil last year, and just a month back I just changed the hose going from the condenser to the compressor cause found some evidence of leak there.

I do actually suspect that the last installers didn't bother to replace the rubber o-ring, cause the coil was only a year old so it couldn't be that it was already damaged. But to access the O-ring at the valve itself would require the disassembly of the whole cooling assembly, and the whole dashboard itself.
Or is there a way to do it without needing to cabut the whole dash?