As a point of trivia, the 190E has an engine driven fan with electric clutch.

To busted's point, there's probably very complex thermodynamics involved in deciding whether a puller or pusher is more effective. I presume Actros means replacing the clutch fan with a puller. If they make electric fans with sufficient CFM to cool a GM big block, they probably make something powerful enough for a 617. The question is, is there enough radiator surface area to fit such a fan? The compromise would be to hang an MB fan on an electric motor

One thing you can try on a cool day is to run a test loop with and without the clutch fan, keeping an eye on the temp gauge. Should be safe in a 617 with a working aux fan for backup. Note mpg and 0-60mph differences to see how much benefit there is to an electric fan.

Sixto
87 300D