In No Country for Old Men, how did the Mexicans find Llewelyn Moss' (Josh Brolin) first motel room?

It's never fully explained, but that's part of the style of the story. They never explain how the Woody Harrelson character finds him in the hospital either.

I think this lack of information is intentional, as it suggests that the Mexicans (and Harrelson) are really good at hunting down people who don't want to be found.

Honestly I have no idea ... I thoght that ending made no frigging sense what so ever ... I think according to the book there was some sort of symbolism involved which makes no sense not to show that symbolism in the movie and expect everyone to understand that crappy ending

Three Mexicans were following his wife and mother-in-law...and one of the Mexicans in the suit asked his mother-in-law which bus they are taking ...she says they are going to El Paso...the Mexican says "I know El Paso, where are you staying ?" ... the dialog ends here, but of course according to the plan they were going to meet Llewelyn Moss at some El Paso motel, which the mother-in-law was aware of...and has very probably disclosed its name to the Mexican...