[CracK]

There is no such a function. You need to destroy and then recreate the vehicle with a new model id
If you mean the command that changes the model of the vehicle you are currently in, then here's it:

pawn Код:

cmd(setcarmodel, playerid, params[])
{
    new model;
    if(sscanf(params,"i",model)) SendClientMessage(playerid, 0xFFFFFFFF, "You haven't specified the model id");
    else
    {
                new Float:x, Float:y, Float:z, Float:a, id;
                id = GetPlayerVehicleID(playerid);
                GetVehicleZAngle(id, a);
                GetVehiclePos(id, x, y, z);
                RemovePlayerFromVehicle(playerid);
                DestroyVehicle(id);
                id = CreateVehicle(model, x, y, z, a, -1, -1, 999999);
                PutPlayerInVehicle(playerid, id, 0);
    }
    return 1;
}

You need zcmd and sscanf for this command to work