My mother is having a problem with her heat pump. I know it could be several things wrong that could make the system act funny, but if someone can give a little insite it would be greatly appriciated. Here is the situation, we are in the Indianapolis area and as everyone in the midwest knows we are in the middle of a heat wave . About two weeks ago my mother came home and and found that her condo air conditioning was not working(she is in a ranch style unit about 1750 sq.f). Had a person out to look at it and the service person put freon in the heat pump said its blowing pretty good and then left with a $90 check. Well that very day the fan in the heat pump stopped working after about 20 minutes. After a couple of days of investigating I noticed that the heat pump will only work after being off for several hours and then only work for twenty minutes or so. I have been looking around and found the origenal instuctions from when the unit was installed. It is a york put in in 1986. I think it said it was a 3 or 4 ton unit with the age it is only 8.5 seer. I have talked to a few people and got several answers from the thermastate to the heat pump. I would like to know what to ask the next service person before mother drops another hundred bucks. Anyone run into this problem before. Any info will be helpful.