I see the nipple between the a/c lines but which vacuum hose goes there?? I have been wondering what that nipple is for for the last 1.5 years! I know I have a leak in the a/c system, I am going to have it converted to r134 in a few months. I will double check the fuse on the compressor as well. Let me know where the other end of the vacuum hose connects too. Thanks