I was trying to define if the leak was on the engine thus burning up and creating a stench! If it smelt bad, then woah... most likely external leak on the exhaust side! (typical)

Minimal or No smell 'could' indicate and external leak away form the engine therefore as it was... a perished hose/radiator or anything else.

I guess if it 'used coolant' and was an internal leak.... it would more likely smell out the exhaust!... but unleaded with a cat stinks anyways..

I have no idea where im going with this... but i hope this helped that kinda question out!
Andrew