that's why I love Mann, but I haven't seen this movie (loved the show when I was in jr high, though.) He tells the story visually, which is what you're supposed to do.
The final scene of Heat, the cat-and-mouse at the airport yard with all those little brightly-colored sheds is probably ten minutes with no dialogue. But the story is intense. Compare with Antonioni's darkroom scene in Blow-Up or when Brolin's character is making the thing to fish out the suitcase in the vent in the Coen's No Country for Old Men. No dialogue, in fact they're damn near silent. That's visual storytelling, something most films could use a lot more of.