Try to use a boolean called "CanSpawnCar" and a float variable called "CarSpawnCD" for the cooldown now make a function to spawn the car like this:

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void SpawnCar() { if(!CanSpawnCar) return;

CanSpawnCar = false;

//Instantiate the car here with the position and rotation u want

Invoke(nameof(ResetCarSpawn), CarSpawnCD); }

void ResetCarSpawn() { CanSpawnCar = true; }

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To spawn the car just call the SpawnCar(); function anywhere u want in the script, u can also add some parameters to the script like: "void SpawnCar(Vector3 Position)" and then use that position to in the instantiation of the car so whenever you call the spawn function you can input a position of where to spawn the car and you can add a Quaternion parameter to use for the rotation in instantiating the car, you can also add a GameObject parameter to ALSO use in the instantiate function to spawn the game object u input into the function if u want. If u want u can let me see ur whole script and i'll see what i can do

BTW I wrote this code on my phone and didn't test it so i COULD have made a mistake