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cowl vent
Hucho devotes a whole chapter to HVAC.
Systems are designed for use as basjoos has described.
Ram affects aren't part of the equation.They're looking for a constant pressure differential across the entire speed range.
Make sure your HVAC extractor vent gravity damper is free to move.You may have to remove the rear bumper fascia to get at it.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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