I honestly cannot believe this has gone on for three pages...we are talking about 2.5 hours...that's a mere 150 minutes, that's about how long you spend in the movie theater if you get there right as the movie before yours is over and you stay for the credits of your movie. OP, heat the car to a point were you are comfortable in a short sleeve shirt. Place your specimens in a tub with some shredded newspaper for a little padding in case you hit a bump or two, and then you just go.
Hand warmers: these are designed for humans and thus reach extremely high temperatures and utilize enough oxygen to transfer heat almost unhindered even when enclosed. This is of very little concern for humans because we are endotherms and because heat transfers from a warmer body to a colder body in a measurable ratio, a hand warmer getting into the low 100s does not bother your 98F body as the warmer itself will distribute most of it's heat to the surrounding area which is colder than YOU. Whereas a snake's temperature is right around the ambient, therefore, almost all the outputted heated will be transferred directly to the animal which causes thermal shock and/or burns.
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