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On the other half of the heater case is the temperature-blend door assembly. Remove this from the case by locating and removing the two retaining screws on the backside of the case.
1966 Mustang Project: Heater Case Rebuild

 On the other half of the heater case is the temperature-blend door assembly. Remove this from the case by locating and removing the two retaining screws on the backside of the case.  View Related Article

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