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My thermostat opens at 184F (though after a change in the black box it may be 186F). I have never seen a temp above 204-205F; which is where the electric fan kicks on.
I have a partial grill block that only has a ~15"x4" opening in the center part of the lower grill. I also have blocked of the "escape vents" that normally allows air to bypass the radiator. All the air that comes in through the opening in the lower grill then goes through the radiator.
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