The info about the fan is the first thing to check. Also make sure the area is cear of debris (lint, leaves etc.) anything that can block the flow of air.
It is also possible that there may be a refrigerant leak. A unit low on refrigerant will ice up.

DN 248 older model, the evaporator is icing up, tried 2 other used t-stats that i know work, tried another evapoator, the whole coil gets covered in snow whith in 3-4 hours, driving me crazy, any help would be appreciated

Sometimes soda or other substances get onto the motor or switch. Remove powere from the motor and manually push the brake down. If it sticks, even momentarily, you need to clean under and around the brake. Denatured alcohol works great. Carefully remolve the two screws holding the brake assembly to the motor and use a q-tip to clean under the brake and on the motor contact surface. Also check the switches on the motor. Look to make sure that the small button under the actuator moves freely. Pop etc. can accumulate there as well. If these areas are clean and free moving and you still have a problem with multi-vending, you may need to replace the motor assembly. This is a common problem with Dixie, Vendo, and Royal. Good luck!!

Dixie Narco 276cc/S11-6

After I press a button to select the soda it kicks out the first one, then continues kicking them out and doesn't stop. Unplugging it is the only way I can get the motor to stop vending. I have tried resetting by many programming resets on the SIID controller and the service push button towards the top.

Problem randomly happened after refilling cans only.

Any help would be greatly appreciated. OK to e-mail direct as well to kevin_klasing@yahoo.com . Thanks.