Excessive coolant burning in the CC will show as white exhaust..
You can also check under the oil fill cap for chocolaty, thick sludge indicating coolant leaking into the crankcase.
No smell in the interior? Then heater core probably OK.
IIRC you can add a dye into the radiator and check with a black light to see if it is leaking around teh engine..
Another trick is run a mirror on a stick around the hoses and heads and water jacket areas to see if it fogs up after shutdown.
Dusting a clean engine with baby powder also will show a leak..
Just a few ideas I can remember from my old rodding days.
