Official temperature records are always shade temps, and are taken a certain distance from the ground and from distorting influences. If it's an official 120 degrees (F) you can easily record 160 in the sun, close to the ground, next to a large radiant object like a car. And it's that 160 degree reading which most accurately describes the effects on the tender human changer-of-flat-tires.
The OP will have many issues to deal with, including his terrified friend, his lack of relevant experience (of which he seems totally unaware) and his own tendency to puffery. But that doesn't mean he won't make it: after all, he's presumably taking the rather straightforward coast route, and most people do make it no matter how clueless (I speak from personal experience!). It's the few who fall off the edge of the known universe in inhospitable deserts, avalanche terrain, traffic accidents or [insert your preferred hazard here] who teach us where the limits and probabilities lie.
Please remit: $0.02
Mark
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