I haven't heard about others having this problem. As far as the heat thing, I would imagine it would be a problem if you haven't let the inside of the car war up before turning the computer on. If you had remote start on your car that could be helpful. You could turn the heater on full blast when you get out at night, that way in the morning you could remote start the car a few minutes before you go to get in it...then it should be nice n toasty for when you want to turn the computer on...
other than that, do a few searches, I know there have been a few people to post about their experiences and what they did to fix the problems that came about.
EDIT: Winter and Harddrive
read that, might help you some!