my truck is leaking coolant....have to fill it up every week or so....i cant see any leaks anywhere...and it doesnt appear to be gettin into my oil...i can smell theantifreeze for a few seconds after i turn the heater on but then it goes away....the lines coming out of the smaller looking raditor thing mounted at the bottom of the radiator look like they are wet, but i have no idea what that is...dont know if it is an oil cooler or a tans cooler or what....anyone know what that is...or if coolant even flows through it....or anywhere that it could possiby be leaking that is common?