Thread: my low coolant light is flashing, any suggestions?

If the reservoir was full but the radiator wasn't I would change the radiator cap and refill the radiator. Then watch it and see what happens in a couple of days. The radiator cap contains a check valve so when the engine cools it's supposed to draw anti-freeze back to the radiator from the overflow tank. After re-filling the radiator don't forget to purge the air from the system.
If the coolant light is flashing and the radiator is low then the sensor is prorably working normally. When the low coolent sensor fails it typically fails "on" which has the light lit on the instrument panel all the time.