I'm stuck can't figure out how to reach the area of where the robot may be

The check markers which I'm good at reading are not working correctly or I'm just missing something? 

If I remember correctly you want to start near Old Mormon Fort in Freeside. Go to the right when you see the kid on a corner talking about Mick and Ralph's store, down that road and past an old train station. Keep going and you should find where the marker is, just kinda out of the way.

The marker is kinda broken when it comes to this particular quest. If you follow it, you'll notice it takes you through this door opposite of the Silver Rush gun store. Once you go through turn left and follow the train station, you'll see this red door on your left-ignore it- continue around it, there's a somewhat hidden pathway through the rubble to the right of that door. This will take you into the backside of Freeside, continue across, and you'll find another door to the robotics building. Hope that helps.

 Alright thanks for the help