2004 Atos Manual

Hello everyone, my name is Alexandra, I am from DF and I just bought an atos and it is failing me a lot of the cloch the truth is already like 4 small chicotes that they thunder, I already take it to the mechanic and tell me that everything is fine and that I have to change it again, so this is not normal, I know that this device is needed but I do not know what it is, if I can help me a lot of MECHANICAL MANUAL OF THIS CARTE HYUNDAY CARRYS WOULD THANK YOU. Bye