'96 Taurus Heating Problems

What I know for sure is...
A) There's a leak in the radiator.
B) The a/c is empty...needs a re-charge.
C) On rainy days, running the fan only makes the fogging worse.

Is it safe to say that a repaired/replaced radiator and re-filled a/c will by default make the defogging go back to normal, or is there perhaps a heater core issue at play here as well?
Thanks in advance...
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