So my radiator has the typical overflow nipple right behind the cap but below that about 4-6" is another nipple that I have no idea where its supposed to run to. My buddies that also have Zs say they don't have that lower nipple and don't know what to do with it. Anyone know where its supposed to run? I probably should have paid a little more attention when I pullex it out 2 months ago to pull the engine.