I have a 2000 Lincoln Nav. that began to leak coolant on the back of the engine.

What is your question?

AT first I thought it to be a hose based on age of vehicle, however further investigation has it leaking without the engine running. I found that when I added coolant as it began leaking immediately and I found it on the back side of the engine next to the firewall. Before I just start taking it apart is their a procedure that I should use and/or is there a freeze plug located on the back of the engine or what should I be looking for or can test to see what it may be? Could it be something I'm not thinking of.