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To get into the case, you will have to carefully remove the case retaining clips found around the circumference of the case halves. Different methods work for different people, but most have good luck with a screwdriver applied as shown to “roll” it off the case lip.
1966 Mustang Project: Heater Case Rebuild

 To get into the case, you will have to carefully remove the case retaining clips found around the circumference of the case halves. Different methods work for different people, but most have good luck with a screwdriver applied as shown to “roll” it off the case lip.  View Related Article

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