[gumby79]

Drive win it is snowing. The snow packs into stagnation points. Modifying the shape until a laminar layer develops guiding the fresh sticky snowflakes around the stagnation/impact point.
I think you will find that the snow will pack in were the road grim is . If the radius was too tight I would have expected to see recirculation / patterns like i see in the upper section


Unless you have an affinity for symmetry I would try moving both openings in the grill block to the inlet side of the radiator for better Delta T when cooling, this might also help with warmup times. You have the equipment to test. Use the scan tool and pin a land mark to the point it hits 90% thermostat open temp and first close with various startup temps. If your log will give you mi/time stamps that makes it easier.

I think your test is good enouph for a dose it work, but as stated multiple runs (3-5) avg would give a more accurate how much. Also how many mi run before testing? Cold diff oil ect. can have a large impact on results

Dream Big Chisel Down To Reality