I am attempting to diagnose and repair and recharge my AC system on my Duramax Diesel 3500 pickup truck. I have attempted to hook up the manifold gauges to test the system but cannot find the high side port to connect the red line to. I did find a port directly behind the alternator, but it appears to be connected to the fuel system perhaps and not the AC system. I actually did connect the red line to it and pulled a vacuum, but noticed if I wiggled and pulled on the connection it would come off. Unlike the low side quick connect which remained firmly attached. I felt it should fit better especially since it is under a great deal more pressure. This caused me to question whether it was indeed the high side port? It did have a shrader valve stem in it and was very close if not the exact size of the red quick connector on the gauge set. Can you verify if this is the high side port and if not, where is it or how do I connect the manifold gauge set without such a port? I am new to this, but have spent hours trying to find an answer. Any help you can give me will be greatly appreciated.
Thanks,
Tony
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Friday, May 26th, 2017 AT 11:28 PM