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What kind of car? Did you get the Focus?
Seems like the general consensus around here is to completely block the upper grille & leave the partial opening, if any, in the lower.
With my Swift, I've got almost the entire grille completely blocked & haven't seen any heating problems. Must watch it close as the weather warms up, though. The ScanGauge is great for this - continuous digital readout of water temperature along with your choice of 3 other readouts.
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