 coolant goes in the bottom hot and as it goes to the top and the fans moving and the air is moving down the road it cools it and then it dumps it back in the top of the engine and it's just worked out better so that is how efficient yeah that's how that system works and they still do in both directions some come out the top some come out the bottom some come out one side and go back in the other side depending on what kind of engine you have but that's perfectly normal for yours and