|
It's isn't to keep the dirt and snow off, it's designed to blow air down over the rear window to prevent exhaust from coming into the vehicle while the window is down. When you are driving there is an eddy of air being dragged along behind you. It's what road bikers take avantage of when drafting behind a truck. Once you let that rear window down though, that air (and exhaust) can easily flow into the cabin which has lower air pressure than the eddy behind you.
So if you do remove the rear window deflector, just make sure not to drive with the rear window down. Or if doing so, keep a front window cracked in order to keep air flowing out and not in the rear window.
|