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 (-F18-) 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.