trentoskomuch

I have heard everything from ruptured heater core, blown head gasket, cracked block, cracked head etc. that could be the meaning of this problem. The other day i filled my antifreeze container up because it was low on coolant, after NOT EVEN DRIVING THE CAR i checked the coolant a couple hours later and somehow it had disappeared. Car is not overheating and runs as good as the day i bought it. what could be the problem? according to the things people say it could be, it just doesnt seem that my car has any of the signs of the things ive previously mentioned. It doesnt run rough, or bad. There isnt any loss in power. Its not overheating. Theres no smoke of any kind coming from the exhaust. Nothing. everything seems as normal and i would think nothing of it aside from the fact that my anti-freeze dis-appears and it shouldnt be. if it was one of the things people have mentioned it could be, wouldnt i have to be physically moving the car for it to be being sucked away? help?!?