My ac is blowing hot air. Went outside to check the unit and the fan wasn't turning. Nudged it with a stick and it begins to turn at about 1/3 on normal speed but only stays on for like 7 minutes. But for those few minutes it would blow cool air. It's 8 years old, should we try fixing parts (if yes which ones)or look into replacing the whole thing? HELP! Orlando, FL