Cole Roberts
Registered User
I have looked for some threads on this but couldn’t find any. I have an 89 7.3. About 5 years ago my factory heater core went out. I have since replaced it with at least 3 other aftermarket heater cores. Every 18 months or so they seem to go out again. Does anyone know of a solution or the right one to buy? Motorcraft doesn’t make them anymore.