It's probably galled up. Even if you get it apart you'll need a new condenser and a new end on the line. Condensers aren't real expensive. The lines are a bit rich, but easy to repair. The dryer will be replaced also. The big fittings on the dryer require BIG wrenches even with good threads.
No harm in trying to separate them with heat and PB, but the new compressor lubricants are corrosive in air and moisture. That locks them up after years of both.
My orifice was in the middle of the line near the radiator support, engine side. This was an L29 BB 'Burb. Yours may be different.
An idea would be to take a die grinder and carefully split the female fitting and just before hitting the male fitting, stop and crack it apart. Stay away from the "O" ring area.
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