Even if the outdoor temperatures were in the 40’s, it would get very hot inside the car with engine and cabin heat running. Also possible is a carbon monoxide component, which was not announced by the media but likely present as well. BTW the resort is at 8,200 feet, not 10,000.
Records say 40 at 8 pm. 20 at around midnight.
I’ve been in a lot of cars under similar conditions and I don’t recall any time conditions became life-threateningly hot.
Hyperthermia in a winter climate as a cause of death just strikes me as really weird. Especially since one of the boys was 4 years old and not exactly a helpless infant strapped into a car seat. Not saying that isn’t what happened. But I’d like to see a similar car placed under similar conditions and see what the temperature rises to.
Not likely. As quite a few people have intended when attempting suicide in their garages.
Modern emission controls make even intentional suicide by CO really difficult using automobile engines.