Spydyr
I've had pretty good luck with blocking the upper opening and restricting the lower. I have also added coroplast ducting between the opening and the radiator. I would guess you could block off three fourths of that lower opening. Do you have a ScanGauge to watch coolant temps? Don't trust the cars stock gauge; they're notoriously inaccurate.
You can see what I've done in my Vibe thread- see link below.
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-Terry
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