I just had a goodman condensor unit (the outside part of a split system) replaced. It was tripping the breaker. The unit was 17 yrs old. My AC man said it sounded like the compressor went out and sure nuf it was. When he let out some freon it smelled like burned plastic… the compressor motor was fried. He replaced it with a 14 SEER Frigidere 4 ton unit for $2800… ouch! Good luck.