I thought all that is inside a radiator is coolant, im amazed that the ATF is actually going into the radiator.

Can somebody explain in more detail abt this? i was under the impression that the tranny is cooled by coolant, ie like the engine block.

what abt other mnakes and models? do they work the same way?

is there such a part to replace the plastic part of the radiator? my friend toyota radiator just sprung a leak and he manage to get the plastic part replace at a fraction of the cost of a new radiator. Can this be done for the w124 then?