There's a round vent welded into the cowl. in that round hole is a flapper gate that has an arm sticking out of it and it clips into the hole. If you don't see the arm sticking out of the side of that round area by the vent, the flapper might be missing. Do you have the dash off or are you trying to see from underneath?
here's a pic of the right side installed and a pic with the dash off and the flapper valve removed from the cowl.
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