Month old thread but I just saw it, this raises a question for me.
If the sensor is bad, then its failure at the same time as the adding of water is a pure coincidence.
If one throws away coincidence, that leaves the adding of water or something he may have unknowingly touched(did I knock a wire?) during the procedure as the cause. Could the changing of the electrolytic properties of the mixture(by adding water, therefor changing the coolant/water ratio) causes the sensor in the bottle not to see any coolant, because the mixture doesn't conduct the way it should? in any case, one should not just add water. One must keep the ratio as prescribed by Saturn. Just because you don't expect the car to encounter -45 doesn't mean there's not a good reason it's prescribed. Don't forget, adding water not only raises the freezing point, it lowers the boiling point too. I just want to know if it's enough to trick the sensor.
And when you add water you need distilled water so you don't put lime, minerals, clorine, flouride etc from tap water into the sytem where it can wreak havoc.
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07 Impala SS
98 Grand Voyager LE