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I dislike the idea of blocking any part of the radiator (not the grille) for the simple reason that the thermostat regulates the amount of hot water that goes in.
If it lets so much in that the heat reaches the lower regions (if maybe you overblocked the grille?) then it needs the cooling it can get in that area. Blocking it reduces the safety margin.
If you do not need the lower part of the radiator at all, then the best solution would be to get a smaller and lighter radiator.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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