How to make AIPath (A*) work on 2D game ?

Is it a top down game? and can't you just lock rotation:

 function LateUpdate() {
     transform.rotation = Quarternion.identity;
 }

or

 private var iniRot : Quaternion;
 
 function Start() {
     iniRot = transform.rotation;
 }
 
 function LateUpdate(){ 
     transform.rotation = iniRot;
 }

Yes my game is TOP-DOWN game. I have locked rotation as you asked, used both of them. Now they just don't move.

If you have rigidbody attached to the game objects there are check box options in the inspector to freeze rotation in whichever axis you desire.

Red

Yes I have Rigidbody2D attached to my vehicles, but I don't have any checkboxes in instpector except isKinematic, FixedAngle.

Are you talking about implementing A* or implementing arongranberg A* pathfinding project. The two are not the same thing, and will result in very different answers.

Please clarify this point.