In early spring, our self-driving minivans visited Lake Tahoe during record snowfall. Now, we’re tackling the other end of the temperature spectrum. After a three-day road trip from Davis Dam to Las Vegas, we took our new self-driving Chrysler Pacifica Hybrid minivans — equipped with all our latest sensors — to one of hottest places on Earth, Death Valley, California. We caught up with Simon, a Waymo senior thermal engineer, on the road.