I just rebuilt the hvac system on my 65. I purchased my heater core from our host. Lil pricey compared to aluminum cores , but fit perfectly…& all copper construction like OE…. I would suggest to make a restriction in hose leading into core… seams to be a life saver against premature failure (?). Not the hardest job to replace,but I sure would hate to have to redo so soon… sorry for your troubles Sprint…
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