I have a 92 continental, just did the intake gasket, I topped up the coolant bottle a few times and when I come out in a couple of hours,the coolant is no longer in the bottle and its bone dry? I've done this several times and the coolant just seems to disappear, rad is full, I squeeze the main hose into the engine it's got in there.....no leaks on the ground or nothing. Car runs mint no smoking or anything.....any help would be greatly appreciated.