I'm going to bet you're getting crossed-up tracing them out. The hot fluid is pumped to the upper fitting, then gravity helps. Not saying that Detroit's (or Toledo's) Quality Control wouldn't allow a mix-up, but I don't think the parts would reach the wrong places. If I'm thinking correctly, the hot, pressure hose is one piece to a coupling somewhere under the lower pulley, and the cooler, return line's coupling is in a slightly different place. Not sure with the factory cooler, though, as ours all have larger, aftermarket coolers on them. If yours is a '97, you're probably due to change the hot line, where it goes from steel to rubber. Ours have all needed this replaced, and as far as I know, the Stealer is the only source. If you notice one is juicier than the other, that's the line going TO the radiator.