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It hasn't affected anything that I've noticed. The fresh air vents are up in front of the windshield, it's just the AC condenser that's down in front of the radiator. Either way, the fan is behind it pulling air, so I think any flow that's lost is relatively trivial. I might experiment with the upper grille blocked instead of the lower one, though, just to see if it makes a difference which one I block.
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