My 2002 Impala 3400, all mods listed in signature with 121xxx miles is having an issue. Randomly my "low coolant level" light has been comming on intermittently. It started out only coming on when I started the car every now and again and going off after a few seconds. Now it comes on every time I drive the car. Its only been coming on every day while driving for less than a week, but was randomly showing upon start for a month or so. My cooling level is spot on weather at operating temp or cold. My oil level is also spot on with 1500 miles till my next oil change. I am still running dex-cool coolant. It could use a flush with a new thermostat. I do not suspect it to be a lim or head gasket, since there is no leak and my fluid levels are fine. I am leaning towards the coolant level sensor but I do not want to throw parts at it without a diagnosis. I have purged or burped the cooling system of air already. My heat works fine at operating temp and I have not come close to overheating. Any other ideas to check before I replace the sensor?