I went from WI to Los Angeles in my '53K and back in mid summer of '64. I do recall a cooler full of ice and various beverages submerged in it by my side throughout. Across NE to Boulder, then down to Albuquerque and across to L.A. Came back through Vegas, UT, WY, and SD. Hot throughout, but nothing really happened. Only time temp went much above normal was in the Vulture Mountains in AZ, but no real problem. Was a grad student at the time, with minimal cash, no credit card, no cel phone, and no one likely to come after me if there was a problem, so being hot was not the greatest concern. Looking back, I must conclude that we were made of sterner stuff in them thar days. Also realize that in all the travel across the country in the '53 it never stranded me anywhere. That's why it is just finishing a 7 year total rebuild, so that it is in the best shape it has ever been since I got it in '58. So there should be no problem taking it to CO in Sept? Well, maybe great silver bird instead this time. Even with credit cars and cel phones.