I'm embarassed to say that I should be able to point to a good project on EcoModder, but I can't think of one. I know Daox has spent more time on variable & automated blocks.
I made a "manual" one that simply had a series of "flaps" I could open as need be.
I'd like to have one that would simply let me start off the trip in fully closed, then open flaps remotely as the drivetrain warms up enough.
I like a variable block that's just enough for the load/ambent temps. EG: today the cooling fan briefly came on 2 or 3 times on a 100 km / 60 mile back roads trip (80 km/h = 50 mph posted limit). If I'd been driving faster or if it were hotter, I'd have needed to open another flap.