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Removing the case from your Mustang isn’t a hard job. Four mounting nuts on the firewall and a large screw above the fresh air door will get the job done. Don’t forget to disconnect or cut the heater hoses. Underdash air systems make the job harder but not impossible. Once the case is dropped down, you can carefully pull the cable retainers off.
1966 Mustang Project: Heater Case Rebuild

 Removing the case from your Mustang isn’t a hard job. Four mounting nuts on the firewall and a large screw above the fresh air door will get the job done. Don’t forget to disconnect or cut the heater hoses. Underdash air systems make the job harder but not impossible. Once the case is dropped down, you can carefully pull the cable retainers off.  View Related Article

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