originally fridge was not cooling. i noticed no air flowing through the vent leading from the freezer. took apart the damper assembly and saw the motorized flapper was closed. pushed on it with a screwdriver and the motor started up and continued to open the flapper all the way. so i replaced the control damper box, part #5304482075. now the new one wont close and fridge is too cold. when i turn off the cold control it closes. any ideas?