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Originally Posted by tblake
Coincitently, my "low coolant" light issues with the original sensor first started happening immediatly after a coolant flush and fill with prestone dex-cool. Maybe the original sensor has compatibilty issues with prestone brand dex-cool? Anyone else notice this?
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Yup. That is the trend I see. I recall some of our members just gave up and disconnected the sensor. As you can see by my pics this GM car had Prestone Extended Life and it had a steady and flashing low coolant warning after switching over from GM brand Dex-cool. However, later on it turned out to be air in the radiator. Replacement of the sensor did not fix the issue. The radiator had a very small coolant leak at the seam of the radiator driver's side below the upper radiator hose fitting. Not even enough to accumulate sufficiently and drip on the ground. All I could surmise is air was being sucked in when the engine was off and during the cool down process. In this case replacement of the radiator resolved the issue.
However, every situation will probably be unique so hard to tell what any real fix will be unless you get lucky.