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Buy a 'heating' scarf for $15 (US), they have two or three pockets built in so you can insert those instant hand warmer packs.
The HotHands packs are .60 cents each when bought in bulk, and last 12-15 hours. For less than $2 per day trip, your neck will be toasty. And you can wear it outside the car as well.
No mods to car needed, just leave the scarf and a dozen heat packs behind the seat.
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