Im embarrassed to ask this but i'm kind of stumped. Low coolant light on the S60. Grabbed a couple used ones from JY and purchased a new OEM blue box level sensors. None of them made the light go away. The coolant level is correct. I installed a new Behr expansion tank a month ago and the float is working just fine. I did have that leak with the small hose under the intake and the tank did run empty a couple of times. I installed the new OEM sensor today and the light wont go off. I also disconnected the battery and cleared the ECU. This is driving me nuts !!