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Most cases temp should be fine with just one opening, but you will need to monitor temps in the first hot spell to get a feel for how coolant temp is in warmer weather.
2 points:
1 / A more favourable result is usually achieved by blocking upper grill and drawing cooling air from the lower grille.
2 / Where does the air go after it passes through the grill, most cars have gaping holes all around the radiator, best results will be achieved if all other holes are sealed and the radiator is the only exit for air passing through the grille.
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