Raidiator.. Coolant Emty - OverHeat

Im having problem with my integra. my raidiator coolant is always emty. i replaced my head gusket, water pump. i dont see any linkage outside the engine.

pls help.


no leak outside the engine?
is there leakage outside of the radiator?
broken hoses?

i dont see any leak outside the engine, even houses and radiator.