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Update. Found the ohm. test for the ECT sensor(-G62-) and circuit. sensor tests good. On the circuit side pin 3 and 4 show low grade continuity to ground. I don't think this is correct. Unable to test the "Coolant Fan Control" thermal switch (-F18-) until I am ready to drain coolant...

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...