What about when you're reading? You don't have a voice in your head saying the words?
Obviously there is a language layer in there somewhere, but my 'driver' doesn't access it. I don't think in words, I don't have an internal narrative, and when I'm reading I don't even 'see' individual words, in the same way you aren't thinking about your ankle muscles when you're hitting the brakes while driving.
I definitely can consciously make words, but it's 'me' deliberately deciding to make them and hold them in my head. It wouldn't happen naturally.