[Jack Houpe]

Jeff if it's from the block and back to the block the aqua Hot absorbs very little amount of the heat energy in the transfer compared to a radiator, it should come out of the block through the aqua hot in back to the input of the radiator therefore a portion of the heat is absorbed in the aqua Hot and the rest is dissipated into the radiator transfer. If it goes from the block through the aqua Hot and back to the block that's a big amount of fluid that could be transferred to the radiator and the heat dissipated. IMHO