Originally Posted by Daniod9
I've heard that it is possible to have too large of a rad, and the pump isn't able to move the water through the rad fast enough to create turbulence. So the water that's cool stays to the outside and the warm water doesn't touch the rad a lot so it doesn't dissipate it's heat. Like a large slow river - near the banks the water is pretty much still. In a small fast river the banks are turbulent.
Maybe a high flow water pump? Or a smaller pulley on the water pump maybe so it spins faster?