AC Box Rebuild-Missing Flapper Door

Dana67Dart said

I think you are correct. I can get a photo if no one else comes through. It on a top shelf in the garage.

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That’s the only place that I’ve seen the holes match up, but not sure what triggers it? There is a little switch on on it, so something must “flip the switch”?

Here is the exact part on EBay. So that part is readily available.

1967 Plymouth Cuda Dodge Dart NOS MOPAR Air Condition & Heater Blower Switch | eBay