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Your experience is similar to mine. I have a large lower opening and a small upper opening like yours. I started by covering the entire lower opening. In warmer weather this proved to be too much, cruising temps were higher and the fan often came on when idling or moving slowly. I made an opening about the width of the license plate and things pretty much returned to normal. For the winter I have the entire lower opening covered. What I want to do is put an insulating blanket on the bottom of the hood. I noticed one day after it snowed and my hood had about 2" of snow still on it that the engine had no trouble maintaining normal temps even under low throttle. Interestingly enough, my Firebird has a hood insulating blanket, which is completely counter productive since it is only driven in warm weather. I plan to assess the feasibility of moving it to the Escort, but I probably won't be able to until the weather is warmer and it is no longer needed.
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