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After more than 30 years of service, your heater case is probably home to several pounds of dirt, leaves, twigs, dead bugs, and more fun stuff. The original foam seals are always long gone, allowing air to pretty much flow where it wants to.
1966 Mustang Project: Heater Case Rebuild

 After more than 30 years of service, your heater case is probably home to several pounds of dirt, leaves, twigs, dead bugs, and more fun stuff. The original foam seals are always long gone, allowing air to pretty much flow where it wants to.  View Related Article

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