I have a 1970 Ponitiac Lemans Sport, I recently purchased it. Anyway, I recently bought a coolant reservoir for it. Well the end of the hose on the radiator is a 1/4" in diameter or so, and the end on the tank is smaller. Doesn't the reservoir tank need to be under pressure with hose sealed on the cap? Right now I just put the hose in the tank, but have not drove it yet, circumstances, and for another day is why.