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One observaton that may be of interest is that when I sealed all around the hood on my 2007 Yaris this past summer the engine bay temp would stay so high that when I removed my warm air duct from above the exhaust manifold [intake air temp was very close to coolent temperature 85C] and simply layed it in the corner of the engine bay the intake air temp on my scanguage did not drop. I then removed the foam tape from the rear of the hood and the temperature droped noticably.
Which suggests that sealing the rear upper part of the engine bay at the hood may be worth some more experamentation...
Thank to Frank Lee for this thread.
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