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I think some of my heating problems could be an inefficiant radiator. It was used when i got it a 28" double pass. inside it looks a little brownish like it may have some calcium build up. just wondering what I should use to clean it with. I tried purple power but didnt do anything. Would...

I have a 76 duster non a/c car and the heater core is leaking. I have avalible a 73 duster parts car with a/c. Are the heater cores the same? will they inter change?