If the compresser is turning on and off it could be a couple of things-one there's a leak in the condenser or elsewhere-two it could be a high preasure switch. My bet is there's a leak somewhere and not letting the compresser stay on long enouth to make cold air. The system could have a slow leak that your indy might not have picked up on-with that said it's not his fault that with the parts he replaced didn't fix your problem completely.
Poolman