Any idea as to how a 2005 Matrix AWD works? Is it full time AWD or is it when the front wheels slip, the back wheels kick in? My wife has a 99 CRV and you can definitely tell when the AWD kicks in but on my 2005 Matrix, I "think" it is working but at times, the front wheels are definitely spinning with nothing really happening in the back? Anyone else having the same issue? Should I have it looked at?