Hi thanks to MoparBrit and Yellowdartdave for the heads up on what I've got under my hood, makes me feel alittle better to know it comes from an A body, I thought maybe it was from a big Chrysler like a Monaco or something!! Eh Dodgenut, I don't know if that part you showed you would want to use, its actually an expansion tank, you'll notice it has a rad cap on it, its actually meant to be part of the pressurized cooling system, not really any different than the top tank on a rad. On that type of system your coolant level is keep usually just below the cap (air in top of tank for expansion of hot coolant) its used with systems that have no radcap/neck on the radiator itself. Using a closed system with a recovery bottle like we're speaking of here should never have air in it, thats one of the bonuses to running it as so well explained by Moparbrit:cheers: