I have a 2016 North American Market Major 80 (4.2l 1105 engine) and I am attempting to recharge the A/C system. I have found the high-pressure service port, which is in front of the condenser, just before the expansion tube, as is common in automotive-type systems, but for the life of me I can't find the low-pressure service port! I have followed the hoses as far as I can see them between the compressor, condenser, and cab post with no sign of a low pressure port. I even opened up the blower cover on the roof of the cab, I can see where the lines connect to the evaporator manifold, but there doesn't appear to be a low pressure service port there either... Where the heck is it?? Does any one know?