Anti-freeze leak

If the hose is regular coolant hose connected with hose clamps, I'd think you could replace the hose by itself. I'm not sure what "assembly" you mean so you may have to be more specific if I'm missing the point.

There is a coolant line that runs from the front of the car and runs along side the oil drain pan on the passenger side of the car. The rubber hose is almost like a "C" shape around the left side of the pan and the connects back to a coolaint line to go back to the body of the car. Pretty hard to explain without a diagram and I can't find any diagrams (schematics) online. Thanks for your response.