[Jim Sims]

If the R-134a leaked out in two weeks its not just due to non-barrier hose. You probably have a leak somewhere (compressor shaft seal, loose hose fitting, or a hole or crack in condenser or evaporator) plus old, damaged hose. R-134a will also diffuse (leak) through new barrier hose, just at a slower rate. A typical 911 AC system has 40 plus feet of hose for the refrigerant to diffuse through.

In an SC OEM factory AC system there are typically five sections of hose. There are two long runs fore/aft: the larger suction line from the evaporator in the smuggler's box to the compressor suction inlet and a smaller high pressure line between the decklid condenser and the front valence condenser. The engine does not need to be removed to replace the hose runs. It is mainly just a cramped, dirty job to replace the hoses with new hoses from a kit. The only skill/care is in tightening the flare connections; tighten only enough to effect a seal (after coating the sealing surfaces with "Nylog") and always back react the tightening torque with another wrench on the other side of the fitting.