Hello,
The following article on our forum will explain in detail how this fan motor works and what to do to fix it -
Replacing GE refrigerator evaporator motors and motherboards
There are two different kind of motors used by GE. You have to determine by yourself which one is used for your fridge before you will order it.
- The evaporator fan motor with a thermistor wired into the connecting harness
Part number: WR60X10074 
- The evaporator fan motor without the thermistor
Part number: WR60X10185 
- The main control board
Part number: WR55X10942 
Here are the breakdown diagrams and
Parts for GE GSH25SGPASS Refrigerator - AppliancePartsPros.com
Gene.