Changing player co-ordinates

Hi

Basically I have two characters, a 2D and a 3D character. I have written a script that allows me to swap between the two upon a key press, it moves the 2D character to the 3D's position and then disables the 3D character or the other way round when swapping back to 2D.

When I swap from back from the 3D to the 2D I want to change the 2D character's Z co-ordinate to 0, but keep the x and y the same. For some reason it just sets the 2D character to the same position each time even if I move all the way off to the right side of the screen it still appears in the same position.

Here's my code...

void Update ()

{

 if (Input.GetKeyDown (KeyCode.Q)) //Go 2D
 { 
     if (number == 0)
     {
         Player1.gameObject.SetActive (true);
         Player1.transform.position = Player2.transform.position;
         Player1.gameObject.transform.position = new Vector3(transform.position.x, transform.position.y, 0);
         Player2.gameObject.SetActive (false);
         GetComponent<AudioSource> ().Play ();
         Debug.Log ("BACK TO 3D");
         number =+ 1;
     }