Copper vs Aluminum heater core for 71 valiant

RustyRatRod said

The big box stores sell millions of aluminum radiators and heater cores a year. If there was a huge problem with them, we'd know it.

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simply you have moisture a leak it could b mayed of gold a leak is some where . simple water steam . ur leak may b some where else . cheap fix a real fine type of stop leak. fine hy dollar but will work.