I think they were inside the car, hilly. Apparently the smell when they opened the car door was what made the people who discovered him report it to the police. He was only opening the window to get snow to drink...
Hibernating is a lovely idea (quite fancy it myself sometimes) but I'm not sure this was the way to go about it. I think a few months in bed watching jezza kyle with on tap room service and an en suite would be more preferable. And then you could star on the show when it was time to rejoin the world... No need for an OFRS, you could just call housekeeping 