It wasn't that cold out. And, the heat inside the car made it to the trunk. Turkey thawed and bled all over the trunk. There was a big rubber mat over the wall to wall trunk carpet. Dad never did get rid of the smell completely. Bleach, high pressure washer, new carpet in trunk, etc. Funny thing was the smell came from the AC vents just after start up. It disappeared after a few minutes or you got used to it. Never did know which for sure.