First off, this is not Esbern not having a sound at all. He just responds with those generic greetings and speeches guards give you (even when you have a quest pointing you to talk to him).
I have finished Alduin's Wall and just recruited 3 of my followers into the blades. Delphine tells me ask Esbern about Dragon locations, I ask Esbern.
He just says "Good afternoon." or something like that when I dialogue (I believe) should appear.
Previously at the Cornered Rat quest, where I rescue Esbern from the Ratway, he spoke fine and had dialogue.
I'd prefer not to download any mods, if possible.
Best Answer
Esbern is a very buggy character in Skyrim. Without mods, skipping through the quest with console commands is a good idea.
Use the
setstage
command to skip through.For example:
setstage TG08A 70
will set the quest stage to the point where you need to talk to Brynjolf in the "Trinity Restored" quest.You'll have to find out which stage to skip to in your case.