I just recently placed a new battery and speakers into a 2015 15” MacBook Pro. To do this I had to take out the entire logic board. Obviously, the fans have to be in the correct position as you can only orientate them one way when installing them. However, cool air now seems to be flowing out of the bottom side grills, and is being sucked in from the hinge area. The airflow has somehow been reversed. I have no idea how this is possible, but it is affecting the temp of the cpu. If anyone has any recommendations on what to do, it would be greatly appreciated.