Mark's routing is slightly different from stock since he doesn't have the water choke. Mine has the hose from the manifold (the black) hose the same, but the red hose from the T goes to the water choke, and the return from the water choke goes to the T at the return pipe on the engine block. So yes, the length of hose he has allows the water to return when the heater is off, and that would normally go through the water choke.