Well lets pose this question ?
aluminum radiators with copper from AC's , wile I did try cutting AL (scoring)
then pulling out copper pipe, but for me I felt it was worse then TV's
Particular cause some of them rad's are multi level THICK
BUT if you have a forge it seems to me you could pre cut rads to chunk size and first melt AL the copper should float to surface like a dross putting fresh chunks of AL rads will cool the mix down as you work . then Next work on copper
Any way just a thought.
Residual freon oil could be a factor
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