Disable Object and Enable by Distance from Player

Good afternoon everybody, I'm working in a script to enable/disable game objectes when they are far from player to increase the FPS. The script is done and have no errors, but he don't disable/enable the game objects, someone could help me? Thanks a lot.

using UnityEngine; using System.Collections; using UnityStandardAssets.Vehicles.Car;

public class DistanceDisabler : MonoBehaviour {

 public GameObject PlayerCar;
 
 public CarController PlayerScript;
 
 public float range = 15;
 
 public GameObject[] ObjectsToDisable;

 
 void Start()
 {
     PlayerCar = GameObject.FindWithTag("Player");
     PlayerScript = PlayerCar.GetComponent<CarController>();
 }
 
 void Update()
 {
     PlayerCar = GameObject.FindWithTag("Player");
     PlayerScript = PlayerCar.GetComponent<CarController>();
     float distance = Vector3.Distance(PlayerCar.transform.position, transform.position);
     {
         if (distance >=  range)
         {
             for (int i = 0; i < ObjectsToDisable.Length; i++)
             ObjectsToDisable[i].SetActive(false);
         }
         else
         if (distance <=  range)
         {
             for (int i = 0; i < ObjectsToDisable.Length; i++)
             ObjectsToDisable[i].SetActive(true);
         }
     }
 }

}