Inspect/Replace
If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
The heater housing is disassembled to get to the heater core.
Heater Core
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.
SOURCE: heater core
Please use this link:
http://www.autozone.com/addVehicleId,1966201/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152800b1ed5
Good luck...
SOURCE: 1979 Bronco Heater core
here is a link to a repair guide i found for your truck. hope it helps.
http://www.autozone.com/addVehicleId,1285203/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c1528004bb8b
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