A/C not working did a vacuum test and holds none. I've done a/c repairs successfully many times and it usually involves a condenser drier orifice tube compressor o-rings oil and refrigerant. I've never done one that has front and rear a/c. Concerned the issue may be with the rear portion. Rubber on the lines looks okay but the metal or aluminum crimp fittings on them show some wear or corrosion. Any way to tell for sure where the issue might be? Looking at the lines that run from the compressor to the rear, I'm not sure replacing those lines and associated parts is something I want to try to do. Looks very complicated, time consuming and expensive. Is there a way to block the rear portion off and at least have working A/C in the front?