WHERE was the coolant spewing from? You have to locate the leak...
The engine block retains some of the coolant. Full is full.
Normal. The lower hose SHOULD be cooler- the top tank is hot coolant straight out of the engine; the bottom tank and hose is coolant that has gone through the radiator and cooled down. That is how the radiator does it's job.
I have NO idea why that was put in there...? Serves absolutely no purpose.