Research published last month looked at the nasal passages of two ankylosaurs, Panoplosaurus mirus and Euoplocephalus tutus. They found that their convoluted nasal passages would have been efficient heat exchange mechanisms.
An article from The Atlantic: https://www.theatlantic.com/science/archive/2018/12/dinosaurs-breathed-through-long-tubes-in-their-noses/578512/
The paper:
Jason M. Bourke, Wm. Ruger Porter, Lawrence M. Witmer
Convoluted nasal passages function as efficient heat exchangers in ankylosaurs (Dinosauria: Ornithiscia: Thyreophora)
Published December 19, 2018, PlosOne
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0207381