My 06 RAV has been doing this from day one and I have been meaning to ask some of you other guys but for about 5 seconds when I first turn the AC on, there is a funny smell that comes from the vents. It actually sorta smells like a burning smell, but after 3 or 4 seconds it goes away and the AC is cooling just fine. Also, it will only do this once a day, like the very first time it is turned on and after that it won't do it again until the next day. Should I be concerned? Like I said, it has done this ever since the day I bought the vehicle. Does anyone else have this problem?