The Audi A6, depending on the year, could have a 3.0-litre or 3.2-litre engine. The water sensor or coolant temperature sensor sends a signal to the computer. The sensor works with the engine coolant sender, which sends the temperature of the engine, via voltage, to the gauge. The computer uses the signal from the sensor to turn the fans on and to adjust the air/fuel mixture.
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Open the bonnet.
Locate the air intake pipe behind the right cylinder head, if your Audi has a 3.0-litre engine. The sensor is in the coolant pipe that is just below the air intake pipe.
Locate the coolant flange just to the left of the cylinder head on the 3.2-litre engine. The coolant temperature sensor is on the coolant flange. If you are unfamiliar with them, the flange is a piece of metal with a host attached to it. The sensor is a plastic piece with wires attached to it.
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