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Inside, we found an original heater core with the date stamp and paint blotch on the end, along with dried seals and a bunch of trash. Remove the core and this metal brace. The fresh air door can be removed by removing the two screws that retain it to the actuating rod.
1966 Mustang Project: Heater Case Rebuild

Inside, we found an original heater core with the date stamp and paint blotch on the end, along with dried seals and a bunch of trash. Remove the core and this metal brace. The fresh air door can be removed by removing the two screws that retain it to the actuating rod.  View Related Article