Not sure what you mean here.
The car will move in the way to where the angle is pointing.
E.g. the little line with the square you see in the editor shows you the initial direction, which can be changed by adjusting your sprite (i believe initially its to the right).
I dont know of a way where you could change the angle without it changing the angle of appearance as well, but this can be worked around with using two objects: One for the car behavior and one for the appearance and using the pin-behavior to have it stuck together.