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I have had to replace two heater cores in my El Camino. I am not brave enough to put a caustic material in my copper heater core. If it does not start leaking on you maybe you got lucky.
I do change out my anti-freeze every two years.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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