[drivemusicnow]

the reason you may have seen things about flushing the radiator, is because a small section of the radiator is used as a tranny cooler.
If you run only the aftermarket cooler, you woudln't really need to do anything with the radiator. If you run them in series, (the only way i see them both as useful) then you probably would want to flush out that section of the radiator.

or if you have money, buy the aftermarket radiator that the group buy thats stickied is all about. but it's definitly not neccesary. just would absolve the need for an aftermarket trans fluid cooler.