Heater core lifespan?

I've had my 07 dodge since day one everything maintained when it should be. It's seems like after 8 years or so the hvac begins to leak freon. Kind of sad imo. Anyways, it was the evaporator core inside the dash that was leaking. My buddy said I was an idiot for not changing the heater core while they had the dash out. 17 years and I still have the original heater core and it sill blows hot.

Now with that being said, I've always had the opinion that heater cores leak because nobody ever...

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