from what I recall on pretty much all GM vehicles I have taken apart - the panel that the cable attaches to needs to be off in order to get appropriate slack to connect to the upper vent;
I believe the cable length is such that it prohibits the ability to connect/disconnect the upper vent flap with the panel installed.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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