Based on your other posts about this problem it is odd that the lower hose was cool (if not cold) as you indicate. I hate for you to waste coolant and money to pull that hose, but it's almost as if there was a plug before or in the hose itself. I don't know what it could possibly be as the hose is fairly sizeable in diameter.
It's frustrating throwing money at parts when you nor the paid mechanics have a good idea as to what it going on.
I would replace the water pump before the replacing radiator.
When it's warm enough for the AC compressor to kick in, turn it on and see if both fans (radiator and condenser) are working.
I don't think it matters (new or old style) regarding your post about replacing the thermostat. I would think it being brand new is fine.
A bad temperature sensor is a good possibility as someone mentioned.
Another far off idea is that maybe the tension on the serpentine belt is not quite right causing the water pump not to be turning optimally. The tensioner is automatic unless it wasn't bolted down tight enough and you are getting too much slack in the belt. Just an idea.
Let us know!