Professional marathoners will train in extra clothing to simulate high temps, no reason your idea shouldn't work. Though I might be careful of doing it while driving. Regularly taking one's temperature through heat threshold training is good practice. It takes weeks if not months to condition one's body to higher temps.old post, but i used to get ready for heat by driving when practical with heater full blast, middle of summer windows up , throw on a sweater, & breath....., it helped, read up on All the heat exhaustion- stroke warning signs, for yourself& others, when u get to that level of body temp, u get confused, dizzy, stubborn, ' im fine', heat stroke is Serious, dont think that you can ' walk it off' , and you'll get over it, u wont, if you get& survive heat stroke, you can never take the heat& cold again, you cooked your bodys thermostat.be safe, lottsa gator aid!!