Sounds like you either didn't get the electrical connector secured properly or you didn't ensure that the valve poppets were positioned exactly like the ones in the earlier picture.
It's critical that they sit up just like the picture because there's a balance in the distance between open and closed. The balance ensures that the valve can direct water either of two ways. If the balance is disrupted, the valve will be biased towards too cold or too hot.
Also, hot air doesn't typically come out of the center vents. Only the sides, defrost and floor.