Well first off, just not liking the OP's choice of radiator, a cross flow and no expansion tank, as you can see in ALL the pictures in this thread each one has an expansion tank. Dodge cooling systems are not pressurized under normal operating conditions. Steam is formed in the expansion tank and is vented out into the air via radiator cap valve into the overflow tube. When the temperature does increase under heavy use, more water flow, more pockets of steam...the radiator cap closes and pressurizing the system. In no other word, if you cannot squeeze the upper hose when the engine reaches operating temps at idle you have issues...
