At the beginning of the movie, Brady drives a black suburban to pick her up. The Chevrolet symbol is clearly on the front of the SUV. When they get back to the lodge, there is no Chevrolet symbol on the front of the vehicle.
When Stephanie gets in the car to go shopping for winter clothes, she asks Brady to turn on the heat. When Brady gets in a few minutes later, he starts the car. If the car wasn't on, there would have been no heat.