Need help with coolant system. 5.3 surge tank with LS1 Radiator

[vannatta20]

My upper radiator hose gets hot but seems to have no pressure or much flow. I can easily collapse it with my hand. I also had it over heat on driving at highway speeds during a long drive. I noticed my 5.3 surge tank has a pressure cap and so does the LS1 radiator. Will having two pressure caps allow it not to work correctly? When it over heated it did it very slowly. Seems like little coolant flow is causing the problem. The e fans cool the radiator very well. Any ideas?