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You can't test the sensor itself, my bentley manual says do the touching the wires together trick to make sure the pump and fan run, and also run the car and get it hot then let it sit after 5 minutes the fan and pump should run, if they don't then replace sender unit.
The sender unit is located just above the thermostat, requires a 22mm spanner to undo it, don't try and do it when the car is even half warm, hot coolant hurts trust me i know!!!.
The only other parts in the system are the relay which most often fails causing the fan to come on and not go off (flat battery) or a blown fuse, now on the S6 the fuse is not in the fuse box why i don't know, it's located in the drivers side kick panel and rated at 15amps, any sort of shorting out whilst testing the pump (wires are constantly live) will result in the fuse blowing. part no is 054 919 369B and comes with a washer already on it
How can you tell if it's working or not from within the car?
There is a thread somewhere. (Sorry can't find it at the mo'). IIRC its very hard to tell if its working from inside the car. You can do a test where you disconnect the plug and touch the two terminals together with a wire to simulate afterun conditions.
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