These vehicles have a notorious TSB(technical service bulletin) on the blower motor resistors.When the resistors fail the fan can only be stuck on one speed, be it low or high, or medium.These are fairly simple to replace, the resistor is located on the evaporator box assembly on both the front and back of the vehicle.The front blower has one and the rear also has it's own.To access the front one, open the passenger side right front door and get down on your knees, look up under the dash and you will see the flying saucer looking object, this is the blower motor, next to this is the resistor, it has two screws and an electrical pigtail that hold it in place.Remove these and the resistor will fall out.Then install the new one.The rear resistor requires removal of the rear interior plastic trim.Be careful with this as to not snap any plastic pieces.The rear resistor install is the same as the front, but you have to remove the trim, that's the only difference.Hope I could help!! Happy Holidays!!