I have a 2009 Kia Borrego. Because of the recent snow fall I attempted to use the 4 HI option instead of the Auto when driving. It does not feel as if the car is switching to 4 HI. The green light comes on in the dash but I don't hear any noise from under the car to show that the transfer case is switching over. If I place it in 4 LO then you can clearly hear it switch over, but not in 4 HI. Its my understanding that the 4 HI is Full Time AWD where the tires all spin together. But 4 HI seems to operate the same way as as in Auto. I stuck my head out the window and hit the gas, the rear tires spun but the front only kicked in after a few seconds, is that normal? Should't all tires be spinning when going from Auto to 4 HI and from Auto to 4 LO. My Kia service department here is terrible so I'm taking it in to another place. Transmission is new and replaced under Kia warranty and has only 8 thousand miles. Any advice would be greatly appreciated.