Re: 1971 Heater Core
Quite some time ago a local radiator shop person mentioned that the center core for a Ford heater was always the same up to some time in the 1970's. The heater core used different ends, but the center core was the same, and all they replaced. Later on found this to be true.
So began unsoldering a few extra old ones using a common Burnz torch. The endcaps were different looking but as mentioned the center was the same. Mine looked to have had poor soldering and leaked out seam in endcap. It also had a bunch of dirt and strips of blue gasket goo inside plugging things up. Installed replacement end caps, and reinstalled whole thing in to auto and it lasted maybe six years. I had thus saved $35 in fixing up older one. Costs about the same now, but replacement costs have gone up.
The removal and replacement of the box for the heater core in a Ranchero takes about four hours, provided you can obtain the tools. Fixing the old heater core takes about 45 minutes. Overall a whole weekend day. Is a section in the official manual on how to R&R the heater core.
Old Ford owner