In a part of Portal 2 there are sliding doors and in the editor there aren't any animations for them; so I can't make them work. The model I'm using is sliding_door_double_noglass. I tried to use a trigger brush entity to make it open but it won't. Is there any way to make it work?

Use a func_movelinear with an invisible texture and parent the door to it.

@FelixGriffin

Thanks! I didn't think about that.