I have a 2005 Ford Escape xlt 4x4 but the 4wd does not work. I live in the snow and get frustrated because as soon as my tires slip I can feel the 4x4 trying to engage, but the rear tires never actually catch. It just keeps slipping and a flashing 4x4 indicator light comes on the dash. I've had the car since 2011 and always just thought the 4wd was terrible because the car can't even make it up the smallest hill in the snow, but I recently realized that the 4x4 has never engaged since I've had it. Is this a common problem with this model of car? If so, what are the most common causes of this problem? I know that's a pretty open ended question, but I just want to know if anyone else has had this problem and what the cause of it was. Thanks!