A heat exchanger usually loses efficiency by fouling. Even a very thin layer of something in the tubes can cut the total heat transfer rate by quite a bit.
Agreed...
Just wondering if coolant passing between a cast iron block, and an aluminum rad has a negative effect on the core...
I've got an OEM copper/brass rad that I've been running for over 20 years...
Appears to be little, or no 'fouling' in the transfer tubes looking in from the filler neck...
