My 2005 Kia Rio had a small pin hole in the top radiator hose so we replaced it and noticed there was rust in the radiator, we flushed it and added anti-frreze and an anti-freeze treatment, now it is overheating while sitting idle, when the car is moving it does not over heat, I noticed when sitting idle in the yard the bigger fan the condensor fan is not cutting on, the air-conditioner fan cuts on when you turn on the ac but not the fan on the back side of the radiator,we tried replacing the relay for the horn with the condensor fan relay and still nothing the fan worked before we replaced the radiator hose and flushed it what coul the problem be???? Please I need your help!!!!!