I have a 2001, A4, 2.8L. The aux. cooling fan runs on until the battery goes dead. In the old days this meant the "Coolant Fan Control" thermal switch (-F1 was bad, or a bad relay for that circuit. Reading my service manual I see that there is also a "Engine Coolant Temp" sensor (-G62-). The manual gives me instructions for testing the circuit but no ohm test for the switches. I don't want to be a parts swapper. Any advice on trouble shooting would be great.