I have a 2000 a6 2.7 turbo I am having overheating issue with the car so I am trying to figure out if my fans not working I got 3 fans 2 understand the hood and one on the outside radiator does anyone know for a fact what there 3 fans does I am thinking the 2 on the inside is the cooling fan but only one I ever see work the one on the outside the radiator thinking it the ac fan .